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 one year ago
Given: costheta= 4/5, sin x =12/13 ,theta is in the third quadrant, and x is in the fourth quadrant; evaluate cos 2x.
119/169
119/169
11/13
 one year ago
Given: costheta= 4/5, sin x =12/13 ,theta is in the third quadrant, and x is in the fourth quadrant; evaluate cos 2x. 119/169 119/169 11/13

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satellite73
 one year ago
Best ResponseYou've already chosen the best response.1you don't need the sine part

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1\[\cos(2x)=2\cos^2(x)1\]

tomhoffhim
 one year ago
Best ResponseYou've already chosen the best response.0dw:1364529999084:dw

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1oh i see there is a \(\theta\) and an \(x\)

aussy123
 one year ago
Best ResponseYou've already chosen the best response.0costheta= 4/5 I need cosx

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1you are asked for \(\cos(2x)\) where \(\sin(x)=\frac{12}{13}\)

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1\[\cos(2x)=12\sin^2(x)\]

aussy123
 one year ago
Best ResponseYou've already chosen the best response.0When I do it I get 169

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1there is no \(\theta \) in your question

tomhoffhim
 one year ago
Best ResponseYou've already chosen the best response.0ok, I'll do it for you, give me a second, this is an easy question

aussy123
 one year ago
Best ResponseYou've already chosen the best response.0yea I had to put theta for that

tomhoffhim
 one year ago
Best ResponseYou've already chosen the best response.0satellite, you don't know what you're doing..

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1\[\cos(x)=12\sin^2(x)\] \[\cos(x)=1(\frac{12}{13})^2\]\

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1\[\cos(2x)=1(\frac{12}{13})^2\] \[\cos(2x)=1\frac{144}{169}\]

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1\[\cos(2x)=\frac{25}{169}\]

aussy123
 one year ago
Best ResponseYou've already chosen the best response.0I know, thats what I get, but it isnt a choice

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1your question asks for \(\cos(2x)\) and doesn't mention any \(\theta\)

aussy123
 one year ago
Best ResponseYou've already chosen the best response.0I know but that is what is already given

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1oh damn i made a mistake!! sorry

tomhoffhim
 one year ago
Best ResponseYou've already chosen the best response.0I'm too lazy to do it but you need to draw the triangles and either use theta or x for the angle

aussy123
 one year ago
Best ResponseYou've already chosen the best response.0lol its okay, Ive made plenty

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1\[\cos(2x)=12\sin^2(x)\] \[\cos(2x)=12\times (\frac{12}{13})^2\] \[cos(2x)=12\times \frac{144}{169}\]

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1\[\cos(2x)=1\frac{288}{169}\]\[\cos(2x)=\frac{119}{169}\]

aussy123
 one year ago
Best ResponseYou've already chosen the best response.0Lol this is a lot of work, can you use this same formula for tan2Theta

aussy123
 one year ago
Best ResponseYou've already chosen the best response.0nvm. I found the formula, Thank you!
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