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

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

(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

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

cos^(4)theta-sin^(4)theta 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

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

The value of 4 sin A cos^(3) A- 4 cos A sin^(3) A is equal to