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Verifying Indentities

Mathematics
Tutor: None Selected Time limit: 1 Day

sin^(4)x-con^(4)x = 2sin^(2)tan^(2)x 

I have never been good with Verifying Trig function. I need help and I don't want to cheat. I would rather fully understand on how to verify the trig functions. If anyone could explain the process to be on how to do it correctly. Please and thank you.

Apr 8th, 2015

sin^4x-cos^4x = (sin^2x+cot^2x)(sin^2x-cot^2x) = *sin^4x(1+sec^2x) (1-sec^2x) = sin^2x(1-ctg^2x) 

sorry what is con^(4)x 

Apr 8th, 2015

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