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If sinA+sinB=l and cosA-cosA-cosB=m, the...

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

A

`(l^(2)-m^(2))/(l^(2)+m^(2))`

B

`(l^(2)+m^(2))/(l^(2)-m^(2))`

C

`(2lm)/(l^(2)+m^(2))`

D

`(2lm)/(l^(2)-m^(2))`

Text Solution

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The correct Answer is:
A
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