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# Integration of cos^3 x

There are many methods to integrate $\sin^3 x$.

## 1. Use trigonometric identity

Given that  $\sin (3x)=3\sin x - 4 \sin^3 x$, $\sin^3 x = \frac{1}{4} [3\sin x - \sin (3x)]$

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KK LEE has been a STPM Mathematics tuition teacher since June 2006, but his love of Maths dates back to at least 1999 when he was Form 4. KK LEE started teaching in 2006 at Pusat Tuisyen Kasturi. He was known as "LK" when he was teaching in PTK. After teaching STPM Mathematics for 8 years in PTK, he joined Ai Tuition Centre in 2014. Over the years he has taught Mathematics (T), Mathematics (S), Mathematics (M), Additional Mathematics.