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Grade: 11
        
if sinx+sin y=3(cosy -cosx),prove that sin3x+sin3y=0
4 years ago

Answers : (1)

PK NAIN
87 Points
							
first divide sinx+siny with cosy-cosx leaving only 3 on RHS and then apply the formulaes of sinc+sind and cosc-cosd  and cancel the terms and ultimately you get answer 
4 years ago
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