hi everyone im ok with normal trig identiies but im confudes with theres any help please : heres the question : 1) sin^4x - cos^4x = sin^2x - cos^2x 2)sec^4x - tan^4x = 1 + 2tan^2x ...thanks
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Originally Posted by mike--1988 hi everyone im ok with normal trig identiies but im confudes with theres any help please : heres the question : 1) sin^4x - cos^4x = sin^2x - cos^2x 2)sec^4x - tan^4x = 1 + 2tan^2x ...thanks 1) . 2) .
Hello, mike--1988! Another approach to #2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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