2. Evaluate $\int \cos^3 x dx$ a. $\sin x - \cos x + C$ b. $\sin x - \frac{1}{3} \sin^3 x + C$ c. $\sin^2 x + C$
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We can rewrite $\cos^3 x$ as $\cos^2 x \cdot \cos x$. Using the identity $\cos^2 x = 1 - \sin^2 x$, we have: $\int \cos^3 x dx = \int (1 - \sin^2 x) \cos x dx$ Show more…
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