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Question Number 169640 by MikeH last updated on 05/May/22

$$\int \cos \left(x^7\right)dx=$$

Commented by mkam last updated on 05/May/22

$$$$$$=\int \mathrm{\Sigma }{(-1)}^n\times \frac{x^{14n}}{\left(2n\right)!}dx=\mathrm{\Sigma }\frac{{(-1)}^n}{\left(2n\right)!}\int x^{14n}dx$$$$$$$$=\mathrm{\Sigma }\frac{{(-1)}^n.x^{14n+1}}{(14n+1)\left(2n\right)!}+C$$

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