Solve the equation sin2x=2cos2x, for

f(x) = x² + 2Cos²x, find f ' (x)a) 2(x+cos x) b) x - sin x c) 2x + sin x d)2(x - sin2x) I got neither of these answers, since
1. 3 answers
2. asked by Terry
3. 1,066 views
Solve the equation 2cos2x = √3 for 0°≤x≤360°I did this: cos2x = √3 /2 2x=30 x=15 x=15, 165, 195, 345 Is this correct?
1. 1 answer
2. asked by Autumn
3. 1,806 views
Solve the equation sin2x=2cos2x, for 0 degrees <=x<=180 degrees
1. 2 answers
2. asked by Charles
3. 3,639 views
what is the exact value of1-2sin(15degrees)? also 2(sin2x)=2sinx solve it for 0<_x_<360 and also 2cos2x=-�ã3 solve it and find
1. 2 answers
2. asked by MRADILAHMED
3. 902 views
Solve the equation of the interval (0, 2pi)cosx=sinx I squared both sides to get :cos²x=sin²x Then using tri indentites I came
1. 4 answers
2. asked by Brian
3. 807 views
Prove the identity:1-cos2x/sin2x = 1+tanx/1+cotx I simplified the RS to tanx. LS:(1-2cos²x+1)/2sinxcosx (2+2cos²x)/2sinxcosx
1. 2 answers
2. asked by sh
3. 1,336 views
Prove the identityCos²x - sin²x = 2cos²x - 1
1. 1 answer
2. 104 views
What am I doing wrong?Equation: sin2x = 2cos2x Answers: 90 and 270 .... My Work: 2sin(x)cos(x) = 2cos(2x) sin(x) cos(x) =
1. 1 answer
2. asked by Anonymous
3. 997 views
Solve the equation for all values of x.-2cos²x-sin x+1=0, on the interval [0,2π).
1. 1 answer
2. asked by AwesomeGuy
3. 609 views
Determine the concavity and find the points of inflection.y=2cosx + sin2x 0≤x≤2pi y'=-2sinx + 2cos2x y"=-2cosx-4sinx How do
1. 3 answers
2. asked by sh
3. 2,284 views