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OpenStudy (df001):
Is this identity prove correct? CosƟ ( SecƟ - CosƟ ) = Sin²Ɵ CosƟ/1 ( 1/CosƟ - CosƟ/1) = Sin²Ɵ 1-Cos²Ɵ = Sin²Ɵ 1=Sin²Ɵ + Cos²Ɵ 1=1
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