sinx +sin3x +sin5x + sin7x = 4cosx cos 2x sin 4x .prove that
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LHS
= sinx + sin3x + sin5x + sin7x
= (sin7x+ sinx )+ (sin5x + sin3x)
= 2sin 4x cos3x + 2sin 4x cosx
= 2sin4x [ cos3x + cosx ]
= 4sin 4x . cos 2x . cosx
=4cosx . cos2x . sin4x
be create a brainly
regards:- rishi arya
= sinx + sin3x + sin5x + sin7x
= (sin7x+ sinx )+ (sin5x + sin3x)
= 2sin 4x cos3x + 2sin 4x cosx
= 2sin4x [ cos3x + cosx ]
= 4sin 4x . cos 2x . cosx
=4cosx . cos2x . sin4x
be create a brainly
regards:- rishi arya
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