Asked by Alli
How do I verify this? Cos^4x-Sin^4x=1-tan^2x/sec^2x
Answers
Answered by
Steve
well, you could start out with a little algebra:
cos^4-sin^4 = (cos^2-sin^2)(cos^2+sin^2)
so you have
cos^2-sin^2
...
cos^4-sin^4 = (cos^2-sin^2)(cos^2+sin^2)
so you have
cos^2-sin^2
...
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