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May 27, 2015

Homework Help: Math, please help

Posted by Jill on Tuesday, January 14, 2014 at 11:10pm.

Which of the following are trigonometric identities?
(Can be more then one answer)
tanx cosx cscx = 1

secx-cosx/secs=sin^2x
1-tanxtany=cos(x+y)/cosxcosy

4cosx sinx = 2cosx + 1 - 2sinx

Find all solutions to the equation cosx cos(3x) - sinx sin(3x) = 0 on the interval [0,2π]. (Points : 5)

π/8,3π/8,5π/8,7π/8,9π/8,11π/8,13π/8,15π/8

π/8,5π/8,9π/8,13π/8

3π/8,7π/8,11π/8,15π/8

π/8,9π/8, 15π/8

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