# 1. Using the half-angle formulas fine the EXACT value of cos(22.5o) 2. verify the identity cos(3x)=(1-4sin2(x))cos(x)...

###### Question:

1. Using the half-angle formulas fine the EXACT value of cos(22.5o)

2. verify the identity

cos(3x)=(1-4sin2(x))cos(x)

3. find the EXACT solutions in the interval [0,2pi)

sin(2beta)-2cos(beta)=0

******Please do not use and decimals in the set or answer process*****

Thank you so much

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