Jennsmiles4u Jennsmiles4u

13-07-2015
Mathematics

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Verify the identity:

cos(a+B)/cos a sin B = cot B -tan a

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crisforp crisforp

13-07-2015

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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