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Grade: 12 

                        
1)prove that (cos x)cos(60-x)cos(60+x) = ¼ cos3x 2)sin 2x -sin5x + sin6x = 0
4 years ago

Answers : (1)

Sourabh Singh
IIT Patna
askIITians Faculty
2104 Points 
							Use exopansion property of cos(A+B) and apply
you will get the answer.
Take sin5x on other side and then use the clubbing property of sinA+sinB.
4 years ago
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