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

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

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

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

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

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

The value of (cos ^(6)5^(@)-15 cos ^(4) 5^(@) sin ^(2)5^(@)+15 cos ^(2)5^(@)sin ^(4) 5^(@)-sin ^(6)5^(@)) is equal to-