2cos^2(3π/2-x/4)-2=0
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cos^2 x2 =1-sin^2 x2
sin^2 x2 -(1-sin^2 x2 )=sin^2 x2-1+sin^2 x2=2sin^2 x2-1=2(1-cosx)/2-1=1-cos x-1=-cos x
sin^2 x2 -(1-sin^2 x2 )=sin^2 x2-1+sin^2 x2=2sin^2 x2-1=2(1-cosx)/2-1=1-cos x-1=-cos x
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