How can I solve this indefinite integral?

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Can someone please show me with steps on how to evaluate this indefinite integral? enter image description here

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Let $u = \sin x \implies du = \cos x\,dx$.

$$\int 3(\,\underbrace{\sin(x)}_{u}\,)^3 \,\underbrace{\cos x\,dx}_{du}= \int 3u^3 \,du$$