SOLUTION: Hi, I have the following answer; cos(2x)=cos(x=x)=cos^2x-sin^2=cos^2-(1-cos^2x)=2cos^2-1 for cos(A+B)=cos A cos B- sin A sin B, find cos(2x) i need one of the followi

Question 904523: Hi,
I have the following answer;
cos(2x)=cos(x=x)=cos^2x-sin^2=cos^2-(1-cos^2x)=2cos^2-1
for
cos(A+B)=cos A cos B- sin A sin B, find cos(2x)
i need one of the following answers:
a)cos x sin x
b)cos x - sin x
c)sin^2x - cos^2x
d)cos^2x - sin^2x
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
cos(2x)= cos^2x - sin^2x RE: Double Angle Formula
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