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francesca

  • 4 years ago

how to prove this identity? tan A=cosec 2A-cot 2A

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  1. shaan_iitk
    • 4 years ago
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    =1/sin2A - cos2A/sin2A = (1-cos2A)/(sin2A) = 2 (sinA)^2/(2sinAcosA) = tanA

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