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प्रश्न
\[\int x^3 \sin x^4 dx\]
बेरीज
उत्तर
\[\int x^3 \cdot \sin x^4 dx\]
\[\text{Let x}^4 = t\]
\[ \Rightarrow 4 x^3 = \frac{dt}{dx}\]
\[ \Rightarrow x^3 dx = \frac{dt}{4}\]
\[Now, \int x^3 \cdot \text{sin x^4} \text{dx}\]
\[ = \frac{1}{4}\int\text{sin t dt}\]
\[ = \frac{1}{4}\left[ - \cos t \right] + C\]
\[ = \frac{1}{4}\left[ - \cos x^4 \right] + C\]
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