(c0s^2a+sin^2a-cos^a+sin^2a)/(1/cos^2a)=2sin^2a*cos^2a=1/2(2sinacosa)^2=1/2sin^2 2a
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(c0s^2a+sin^2a-cos^a+sin^2a)/(1/cos^2a)=2sin^2a*cos^2a=1/2(2sinacosa)^2=1/2sin^2 2a