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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Solve it
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[Post New]9 Jun 2008 17:04:33 IST
    Subject: Solve it
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rahulraj1 (14)

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Using the fact that sin(A+B)=sinAcosB+cosAsinB and the differentiation , obtain the sum formula for cosines?
    
[Post New]9 Jun 2008 17:16:49 IST
    Subject: Re:Solve it
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allamraju (3437)

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It is simple,differentiate w.r.t to A on both sides,(then B is a constant),we get,


cos(A+B)=(cosA)cosB+(-sinA)sinB=cosAcosB-sinAsinB.
MAKING A MISTAKE IS HUMAN BUT REPEATING IT IS IDIOTIC.
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