Derivative of y=e^3secx

1. The derivative of a constant times a function is the constant times the derivative of the function.

   1. Rewrite the function to be differentiated:

      $$\sec{\left(x \right)} = \frac{1}{\cos{\left(x \right)}}$$

   2. Let $u = \cos{\left(x \right)}$.

   3. Apply the power rule: $\frac{1}{u}$ goes to $- \frac{1}{u^{2}}$

   4. Then, apply the chain rule. Multiply by $\frac{d}{d x} \cos{\left(x \right)}$:

      1. The derivative of cosine is negative sine:

         $$\frac{d}{d x} \cos{\left(x \right)} = - \sin{\left(x \right)}$$

      The result of the chain rule is:

      $$\frac{\sin{\left(x \right)}}{\cos^{2}{\left(x \right)}}$$

   So, the result is: $\frac{e^{3} \sin{\left(x \right)}}{\cos^{2}{\left(x \right)}}$

The answer is:

$$\frac{e^{3} \sin{\left(x \right)}}{\cos^{2}{\left(x \right)}}$$