Prove the identity
{{{matrix(1,3,(1-2Cos^2x)/(Sin(x)*Cos(x)),"=",... (answered by Edwin McCravy)

I need to prove the identity.

(cos 2x) / (1 - tan^2 x) = cos^2... (answered by stanbon)

prove that:  1-2cos (x)= 4(cos(x))^2  (answered by math_helper)

Prove that the following is an identity:

1) (4sin^2 x*cos^2 x) = 1 - cos^2 2x  (answered by lwsshak3)

Sin(x).tan(x)/cos(x) + 1 = 1/cos^2(x)

Prove the... (answered by Alan3354)

Prove the identity:

2Sin X • Cos X ÷ (Sin X + Cos X)^2 - 1 = 1

 (answered by Shai)

cos^2x-sin^2x=2cos^2x-1  verify the... (answered by stanbon)

Prove the following identity:... (answered by Edwin McCravy)