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22 September, 13:12

Tan A (secA-cosA) / sinA

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  1. 22 September, 13:15
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    tan A (secA-cosA) / sinA = tan²A

    Step-by-step explanation:

    tanA (secA - cosA) / sinA = (SinA / CosA) (secA - cosA) / sinA

    = (1 / CosA) (1 / CosA - CosA) = 1 / Cos²A - 1 = (1 - Cos²A) / Cos²A

    = sin²A / Cos²A

    = tan²A
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