Question

Prove this is true

Answer 1

\[(\sin^4x-\cos^4x)/(\sin^2x-\cos^2x)=1\]

Answer 2

HINT:\[a^4 -b^4 = (a^2+b^2)(a^2-b^2) \]

Answer 3

ahhhhh... Of course.. Let me see how that goes

Answer 4

I got it. thanks a bunch man

Answer 5

Glad to help.