सदिश विधि से सिद्ध करे कि `sin(A-B)=sinA.cosB-cosA.sinB`.

sin(A-B)=sinA cos B-cosA sinB

Multiply sin(A+B)=sinA cosB+ cos A sinB and sin(A-B)=sinA cosB - cosA sin B

If A=B=45^(@) , then justify sin(A+B)=sinA cosB+cosA sinB.

(sin^2A-sin^2B)/(sinA.cosA-sinB.cosB)=....

Using the fact that sin(A+B) = sinA cosB + cosA sinB and the differentiation, obtain the sum formula for cosines.

(sinA-sinB)/(cosA+cosB)+(cosA-cosB)/(sinA+sinB)=0 .

Prove that: sin(A+B)+cos(A-B)=(sinA+cosA)(sinB+cosB)

If sinA+sinB=sqrt3(cosB-cosA),then sin3A+sin3B=

If sinA+sinB=sqrt3(cosB-cosA),then sin3A+sin3B=