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Answers by Shawn L.

(2sin18)(cos18) (answer)

recall double angle sin(2x) =2sinx cos x, therefore, (2sin18) (cos 18) = sin 36.  

I dont know how to start this equation (answer)

You move terms w/ variables to one side and constant term to the other side:    sqrt(3) x -x = -6 Factor out x:    (sqrt(3)-1) x = 6 divide the (sqrt(3)-1) from both sides:    x = 6 / (sqrt(3)-1) multiply sqrt(3)+1 to both numerator and...