trigonometry HELP pleasE!

these must be written as a single trig expression, in the form sin ax or cos bx.

a)2 sin 4x cos4x
b)2 cos^2 3x-1
c)1-2 sin^2 4x

I need to learn this!! if you can show me the steps and solve it so I can learn I'd be grateful!!!

1) apply the formula for sin 2z
2)3) cos^2z + sin^2 z =1 in both of these. substitute this for the 1 in the equations.

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asked by jim
  1. Sin^2x-2sin2x-5cos^2alfa=0

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    posted by Nuni

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