15(sin2θ + cos2θ) × 37(sin2π + cos2π) = 0

15(sin2θ + cos2θ) × 37(sin2π + cos2π)
=15√2（sinθcos45°+cos2θsin45°）× 37(0+ 1)
=15√2×37×sin（2θ+45°）
=555√2sin（2θ+45°）

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