November 27, 2015

Homework Help: Trigonometry

Posted by Holly on Wednesday, July 31, 2013 at 9:47pm.

Find all solutions of 4(cos(x))**2-4 sin(x)-5=0 in the interval (6pi, 8pi)

I tried to work it out and got: 4(cos**2x)-4cosx -9 = 0, but I can't figure out what cosx = from there to finish the problem.

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