cotA-tanA/cotA+tanA=cos squareA
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Step-by-step explanation:
cotA-tanA/cotA+tanA
=(cosA/sinA)-(sinA/cosA)/(cosA/sinA)+ (sinA/cosA)
=cos²A-sin²A/cos²A+sin²A
=cos²A-sin²A
=cos2A
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