Question

Express 2sin4x*cos2x as a sum or difference of two trigonometric function.


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Answer 1

Answer:

2 sin A and cos B = sin (A+B) + sin (A-B)

2 sin 4x cos 2x

= sin (4x+2x) + sin ( 4x - 2x)

= sin (6x) + sin (2x)

= sin 6 + sin 2x