(sin alpha +cos alpha )(tan alpha -cot alpha)=sec alpha +cosec alpha
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(sinA+cosA)(tanA -cotA)
=(sinA+cosA)(sin^2A-cos^2A/sinAcosA)
=-(sinA+cosA)(cos^2A-sin^2A/1/2×2sinAcosA)
that is your turn to complete
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