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Simplify (1+tan^2y)(cos2y-1)
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Simplify (1+tan^2y)(cos2y-1)

User Ekin Koc
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1+tan^2(y)=1/cos^2(y)
cos 2y -1=cos^2(y) -sin^2(y)-cos^2(y) -sin^2(y)


User SimonPJ
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