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Question
Express the following as a sum or difference of two trigonometric function:
2 sin 4x cos 2x
Sum
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Solution
2 sin 4x cos 2x
= sin (4x + 2x) + sin (4x – 2x)
= sin 6x + sin 2x
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Chapter 3: Trigonometry - 2 - Exercise 3.4 [Page 51]
