1.

If sinA+sinB=l and cosA-cosA-cosB=m, then cos(A-B)=

Answer»

`(L^(2)-m^(2))/(l^(2)+m^(2))`
`(l^(2)+m^(2))/(l^(2)-m^(2))`
`(2LM)/(l^(2)+m^(2))`
`(2lm)/(l^(2)-m^(2))`

ANSWER :A


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