cosA/1-tanA - sin2A/cosA-sinA = cosA+ sinA
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LHS=cosA1−tanA+sin2AsinA−cosA
=cosA1−sinAcosA+sin2AsinA−cosA
=cos2AcosA−sinA+sin2AsinA−cosA
=−cos2AsinA−cosA+sin2AsinA−cosA
=−cos2A+sin2AsinA−cosA
=sin2A−cos2AsinA−cosA
=(sinA+cosA)(sinA−cosA)sinA−cosA
=sinA+cosA
=RHS
navn4420:
hi happy Republic Day
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