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any of you guys good at trig? i got this assignment and cant figure out how to get the angle in this damn question 2 + cos2x = 3cosx i keep getting : (cosx)^2 = -2 which is impossible any help?
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Rank: You're gonna stick that where?
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use a ti 83 plus calculator
i did it and got 0 but im just in geometry so dont trust me lol  MakeSureItsCharcoalGrilled wrote: you, sir, are a complete dickhead! thank you for your insightful contribution. please don't ever return. Cantrip wrote:EXSUGO MEUS TESTIS abby whip pwnage! -------------(>*.*)>----->
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It's been a while, but one way you can test how an equation will behave is to start plugging in numbers. I think this is the solution. Sort of a trick question designed to make you waste your time in order to teach you there are tricks. I tried using 0 =x. cos(0) =1. So if you have:
2 + cos (2*0) = 3 cos (0)
2 + cos (0) = 3 cos (0)
2 + (1) = 3 (1)
2 + 1 = 3
Which works with the equation so x = 0. You should be more like Cantrip.  Twitchy: "I pulled a Cantrip . . ." GivePeaceAChance: "If the Tempest had nipples, I'd pinch that shit." Xylicon: "I'm about to deliver my [Richard] in your face for posting that stupid shit. " WDF?: "He keeps reaming me... night after night... I'm rather sore." GivePeaceAChance: "OMG MY NIPS ARE HARD" llenta: "cantrip, you fail!!!" Filliam H. Muffman: "i'm on top of dick"
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Cantrip wrote:
It's been a while, but one way you can test how an equation will behave is to start plugging in numbers. I think this is the solution. Sort of a trick question designed to make you waste your time in order to teach you there are tricks. I tried using 0 =x. cos(0) =1. So if you have:
2 + cos (2*0) = 3 cos (0)
2 + cos (0) = 3 cos (0)
2 + (1) = 3 (1)
2 + 1 = 3
Which works with the equation so x = 0.
Looks right to me, Cantrip. Remember though, that sinusoidal functions have infinite periods in an open domain, so you have to take account for all of them. So, 0 is just one of the answers. It also equals eachother at 30, 390, etc. So that is pi/3 + 2*pi*N. It also equals eachother at -120, 240, 600, etc. So, your other answer is 7pi/3 + 2*pi*N So your final answers: 0, pi/3 +2pi*N, 7pi/3 +2pi*N (in radians). 0, 30º+360N, 240º+360N (in degrees, though in calculus you can only have it in radians). That's only if they DO NOT give a specific domain in which to find X. It looks tricky because of the coefficients, but be sure to remember the trig values for the axis angles (0 {360}, 90, 180, 270). You could also plug both equations into your graphing calculator: Y1 = 2+cos(2x) Y2 = 3cos(x) Find the intersecting values so you can see how this works graphically. {pDs} Lead Salad: bike why did you change your name
Jessica343: so I can get heals
{pDs} Lead Salad: oh damn good idea
{pDs} Lead Salad has changed their name to {pDs} Lead Salad (is a girl)
Jessica343: hahah
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Rank: Admiral OCD
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Stand by for a reproducible result. Damn you, must answer question.
EDIT -GPAC edited his answer. Looking at his answer, and at a basic refresher of trig, I'm going to retract my answer - though it's the answer, or at least one of the answers if there are others, like 360, and multiples of that.. Will give it five more minutes of review, then I quit. You should be more like Cantrip. Twitchy: "I pulled a Cantrip . . ." GivePeaceAChance: "If the Tempest had nipples, I'd pinch that shit." Xylicon: "I'm about to deliver my [Richard] in your face for posting that stupid shit. " WDF?: "He keeps reaming me... night after night... I'm rather sore." GivePeaceAChance: "OMG MY NIPS ARE HARD" llenta: "cantrip, you fail!!!" Filliam H. Muffman: "i'm on top of dick"
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Haha, I just realized he psoted this at 7:30 PM, so I guess he either has an answer or got help from someone else by now. :B. So, Carr, anyone, any more problems? I like math. {pDs} Lead Salad: bike why did you change your name
Jessica343: so I can get heals
{pDs} Lead Salad: oh damn good idea
{pDs} Lead Salad has changed their name to {pDs} Lead Salad (is a girl)
Jessica343: hahah
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GivePeaceAChance wrote:Haha, I just realized he psoted this at 7:30 PM, so I guess he either has an answer or got help from someone else by now. :B.
So, Carr, anyone, any more problems? I like math. You asian or something? Math blows hard.
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buzzsaw wrote:GivePeaceAChance wrote:Haha, I just realized he psoted this at 7:30 PM, so I guess he either has an answer or got help from someone else by now. :B.
So, Carr, anyone, any more problems? I like math. You asian or something? Math blows hard. Hahah. I pwn at it. that's why. {pDs} Lead Salad: bike why did you change your name
Jessica343: so I can get heals
{pDs} Lead Salad: oh damn good idea
{pDs} Lead Salad has changed their name to {pDs} Lead Salad (is a girl)
Jessica343: hahah
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STFU NOOBS. Last thing i want to see when I come here is fucking math. post in Tech support or something. love, snooch. You wanna take this to Fuck Town?
Oh gadzooks, yes!
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::ANY NAME:: wrote:STFU NOOBS. Last thing i want to see when I come here is fucking math. post in Tech support or something.
love,
snooch. Actually, since I am a Texas Tech student, this is Tech support. Eat me :-D {pDs} Lead Salad: bike why did you change your name
Jessica343: so I can get heals
{pDs} Lead Salad: oh damn good idea
{pDs} Lead Salad has changed their name to {pDs} Lead Salad (is a girl)
Jessica343: hahah
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Rank: Admiral OCD
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LOL.
Carr, is that first 2 within the first cosine a superscript? As in Cos2x ?
EDIT- Hmm. I clicked on the superscript box but I guess it's not showing up. I intended the number 2 in the above to be superscripted. As in to the power of 2. You should be more like Cantrip. Twitchy: "I pulled a Cantrip . . ." GivePeaceAChance: "If the Tempest had nipples, I'd pinch that shit." Xylicon: "I'm about to deliver my [Richard] in your face for posting that stupid shit. " WDF?: "He keeps reaming me... night after night... I'm rather sore." GivePeaceAChance: "OMG MY NIPS ARE HARD" llenta: "cantrip, you fail!!!" Filliam H. Muffman: "i'm on top of dick"
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Cantrip wrote:
LOL.
Carr, is that first 2 within the first cosine a superscript? As in Cos2x ?
If it is, I will be fucking pissed. Haha. That is when I don't like math when I did a problem that wasnt right, or useless. {pDs} Lead Salad: bike why did you change your name
Jessica343: so I can get heals
{pDs} Lead Salad: oh damn good idea
{pDs} Lead Salad has changed their name to {pDs} Lead Salad (is a girl)
Jessica343: hahah
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Rank: You're gonna stick that where?
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yeh i managed to work it out man i cant remember anythin from highschool now university is killin me
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