Robert J. answered • 01/05/14
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tan^4x+2tan^2x+1
= (tan^2x+1)^2
= sec^4x, since tan^2x+1 = sec^2x
Serenity E.
asked • 01/05/14Verify tan^4x+2tan^2x+1=sec^4x
This is for my trig class, thanks for the help!
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