Question

What is sin 7x + sin 4x ?

Answer 1

Answer:

=(sin7x+sinx) +sin4x =sin(4x+ 3x) +sin(4x-3x) +sin4x so by using: sin(A+B) + sin(A-B) =2sins. cosB 2sin4x.cos3x+sin4x

Answer 2

Answer:

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