to prove that sin²A/cos²A=tan²/sin²A

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to prove that sin²A/cos²A=tan²/sin²A

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Prove that: (1-cos2A)/sin2A = tanA

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If sinA=12/13 then sin²A-cos²A/2sinAcosA ×cot²A =?

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If ` cos^2 A - sin^2 A = tan^2 B` then prove that ` 2 cos^2 B -1 = tan^2 A`