यदि `A=60^(@),B=30^(@)` हो तो सिद्ध करें कि
`cos(A+B)=cosA*cosB-sinA*sinB` .

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

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

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

(cosA+cosB)^2+(sinA-sinB)^2 is equal to

(sinA+sinB)/(cosA-cosB)+(cosA+cosB)/(sinA-sinB)=?

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

Prove that (sin A+sinB)/(cosB-cosA)=(cos A+cosB)/(sinA-sinB) .

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

If sin(A-B) =1//2 and cos(A+B)=1//2 , then what is the value of sinA cosA + sin^2A sinB cosB +cos^3 A cosB tanA यदि sin(A-B) =1//2 तथा cos(A+B)=1//2 ,का तो मान sinA cosA + sin^2A sinB cosB +cos^3 A cosB tanA क्या है?