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(sinA+sinB)/(cosA+cosB)=tan((A+B)/2)...

`(sinA+sinB)/(cosA+cosB)`=`tan((A+B)/2)`

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(sinA-sinB)/(sinA+sinB)=tan((A-B)/2).cot((A+B)/2)

(sinA-sinB)/(sinA+sinB)=tan((A-B)/2).cot((A+B)/2)

Prove the following identity : (sin A-sin B)/(cosA+ cosB)+ (cosA-cosB)/(sinA+sinB)=0 .

(sinA-sinB)/(cosA+cosB) is equal to