Posted by NEED HELP NOWW!! on .
sec^4x  sec^2x = tan^4x + tan^2x

TRIGO HELP!!! NEEDED NOW 
Steve,
you want a proof?
sec^4  sec^2 = sec^2(sec^2  1)
= sec^2 tan^2
= (tan^2 + 1)(tan^2)
= tan^4 + tan^2
Posted by NEED HELP NOWW!! on .
sec^4x  sec^2x = tan^4x + tan^2x
you want a proof?
sec^4  sec^2 = sec^2(sec^2  1)
= sec^2 tan^2
= (tan^2 + 1)(tan^2)
= tan^4 + tan^2