Answers

2016-04-26T21:33:52+05:30
Msin$ +ncos$ = p ...(1)
msin$ -ncos$ = q ...(2)
squaring eq.1&2 then add
m²(sin²$+cos²$)+n²(sin²$+cos²$)=p²+q²
m² + n² = p² + q²
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