1. $\int \frac{e^{x}91+x}{{\cos }^2\left(x{e}^x\right)}dx=f\left(x\right)+c;f\left(x\right)=?$

• A. $\sin \left(x{e}^x\right)$
• B. $\sin \left(x{e}^x\right)$
• C. $\sin \left(x{e}^x\right)$
• D. $\sin \left(x{e}^x\right)$

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