Asked by Jin

how does

secx(tanx + tan^2x- sec^2x)

simplified to
sec x (tanx -1)?

Answers

Answered by Reiny
you should have come across the identity
sec^2x = tan^2x + 1

(by dividing each term of sin^2 + cos^2x = 1 by cos^2x )

sub back in , and you got it
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