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`(cosecA - sinA)(secA - cosA)sec^2A = tanA`

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`(cosecA - sinA)(secA - cosA)sec^2A = tanA`
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`L.H.S. = (cosecA-sinA)(secA-cosA)sec^2A`
`=(1/sinA-sinA)(1/cosA-cosA)1/cos^2A`
`=((1-sin^2A)/sinA)((1-cos^2A)/cosA)1/cos^2A`
`=((cos^2A)/sinA)((sin^2A)/cosA)1/cos^2A`
`=sinA/cosA`
`=tanA=R.H.S.`
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