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Abdelrhaman Abdelrhaman
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11 years ago
can someone please tell me how to do this:
sec^4x - tan^4x = 1 + 2tan^2x
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#1
11 years ago
sec^4 x - tan^4 x
= (tan^2 + 1)^2 - tan^4 x
= tan^4 + 2tan^2 x + 1 - tan^4 x
= 2tan^2 + 1
= 1 + 2tan^2 x
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