sin^2 31 - cos^2 59 : evaluate
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by using simple conversion
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sin^2(31°)-cos^2(59°)
=sin^2 (31°)- cos^2 (90°-31°)
=sin^2 (31°)-sin^2 (31°)
=0
=sin^2 (31°)- cos^2 (90°-31°)
=sin^2 (31°)-sin^2 (31°)
=0
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