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September 5, 2015

Homework Help: Math (trigonometric identities)

Posted by Kim on Tuesday, December 4, 2012 at 10:46pm.

I was given 21 questions for homework and I can't get the last few no matter how hard and how many times I try.

17. Sinx-1/sinx+1 = -cos^2x/(sinx+1)^2

18. Sin^4x + 2sin^2xcos^2x + cos^4x = 1

19. 4/cos^2x - 5 = 4tan^2x - 1

20. Cosx - sinx - cos^3x/Cosx = sin^2 - tanx

21. Sin^2x - 6sinx + 9/sin^2x - 9 = sinx-3/sinx+3

Especially the last three!

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