1)prove that (cos x)cos(60-x)cos(60+x) = ¼ cos3x
2)sin 2x -sin5x + sin6x = 0
1)prove that (cos x)cos(60-x)cos(60+x) = ¼ cos3x
2)sin 2x -sin5x + sin6x = 0
2)sin 2x -sin5x + sin6x = 0
Raghav Rao , 8 Years ago
Grade 12
Trigonometry> 1)prove that (cos x)cos(60-x)cos(60+x) = ...
1 Answers
Sourabh Singh
Last Activity: 8 Years ago
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.
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