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(Cot-cosec) ^2=1-cos/1+cos

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(Cot-cosec) ^2=1-cos/1+cos

    • Posted by Priyan J.V. 4 years, 9 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Atuly Yadav 4 years, 9 months ago

    LHS, (cot-cosec)² =(cos/sin-1/sin)² =(cos-1/sin)² =cos²+1-2cos/sin² =2-2cos-1+cos²/1-cos² =2(1-cos)-1(1-cos²)/1-cos² =2(1-cos)-1((1-cos)(1+cos))/(1-cos)(1+cos) =(1-cos)(2-1-cos)/(1-cos)(1+cos) Hence, (1-cos)/(1+cos) prove.

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