Question 9 Evaluate $\int \sin x \cos^2 x \,dx$. $\circ \frac{\cos^3 x}{3} + C$ $\circ \frac{\cos^3 x}{3}$ $\circ -\frac{\cos^3 x}{3}$ $\circ -\frac{\cos^3 x}{3} + C$
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We can use a substitution method to solve this integral. Let $u = \cos x$. Then, the differential $du$ with respect to $x$ is $du = \frac{d}{dx}(\cos x) \,dx = -\sin x \,dx$. From this, we can express $\sin x \,dx$ as $-\,du$. Show more…
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