Answers

2014-02-27T15:16:55+05:30
The numerator will be zero after simplification.and then the total value of the problem will be zero.
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2014-02-28T12:50:20+05:30
By cross multiplication
[(sinA-sinB)(sinA+sinB)+(cosA-cosB)(cosA+cosB)]/(cosA+cosB)*(sinA+sinB)
so
[sin^2A-sin^2B+cos^2A-cos^2B]/(cosA+cosB)(sinA+sinB)
o
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