Question

PROVE THAT:-

Cos⁴ A - cos²A = sin⁴A - sin²A

Answer 1

heya....

cos^4 A- cos^2 A

=cos^2 A(cos^2 A-1)

=(1- sin^2 A)*(-sin^2 A)

=sin^4 A - sin^2 A

hence proved

Answer 2

☺ Refer the attachment for the solution☺

Thanks....☺