1tanA-cotA=2sin²A-1/sinA.cosA
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Step-by-step explanation:
2sin²A-1/sinAcosA
=2sin²A-sin²A-cos²A/sinAcosA
=sin²A-cos²A/sinAcosA
=sin²A/sinAcosA-cos²A/sinAcosA
=sinA/cosA-cosA/sinA
=tanA-cotA
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