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Elan Coil [88]
4 years ago
13

Verify the identity: cos(a+B)/cos a sin B = cot B -tan a

Mathematics
1 answer:
alexgriva [62]4 years ago
5 0
Cos( A + B ) = cosAcosB - sinAsinB ;
cos( A + B ) / ( cosAsinB ) = ( cosAcosB - sinAsinB ) / ( cosAsinB ) = ( cosAcosB ) / ( cosAsinB ) - ( sinAsinB ) / ( cosAsinB ) = cosB / sinB - sinA / cosA = cotB - tanA ;
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