Question
Solution
cosA(1+sinA)+cosA(1-sinA)/(1-sinA)(1+sinA)=4 cosA(1+sinA+1-sinA)/1-sin2 A=4 cosA (2)/cos2 A=4         [as sin2A+cos2A=1] 2/cosA=4 1/cosA=2 cosA=1/2 cosA=cos60° A=60°
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