If a= 15 degree, prove that 4 sin 2a.cos 4a.sin6a=1
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4 sin 2*15. cos 4*15.sin 6*15
4 sin 30. cos 60. sin 90
4 1/2. 1/2. 1
2.1/2
1
rhs proved
4 sin 30. cos 60. sin 90
4 1/2. 1/2. 1
2.1/2
1
rhs proved
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