(cos^(4)A-sin^(4)A)" is equal to "

(cos^(4) x - sin^(4) x) is equal to

cos^4A-sin^4A is equal to (a) 2cos^2A+1 (b) 2cos^2A-1 (c) 2sin^2A-1 (d) 2sin^2A+1

If cos A + cos^(2) A = 1 , then sin^(2) A + sin^(4) A is equal to

What is ( cos ^(4) A - sin ^(4) A)/( cos ^(2) A - sin ^(2) A) equal to ?

The value of the definite integral int_(-(pi)/(4))^((pi)/(4)) (dx)/((1+e^(x cos x))(sin^(4)x +cos^(4)x)) is equal to

cos^(4)theta-sin^(4)theta is equal to

cos^(4)theta-sin^(4)theta is equal to

The value of log_((sin^2x+cos^4x+4))(cos^2x+sin^4x+4) is equal to

17*cos^(4)theta-sin^(4)theta is equal to (a)1-2sin^(2)((theta)/(2))(b)2cos^(2)theta-1(c)1+2sin^(2)((theta)/(2))(d)1+2cos^(2)theta