Derivative of 2cos(2x)-2sin(2x)

1. Differentiate $- 2 \sin{\left(2 x \right)} + 2 \cos{\left(2 x \right)}$ term by term:

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

      1. Let $u = 2 x$.

      2. The derivative of cosine is negative sine:

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

      3. Then, apply the chain rule. Multiply by $\frac{d}{d x} 2 x$:

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

            1. Apply the power rule: $x$ goes to $1$

            So, the result is: $2$

         The result of the chain rule is:

         $$- 2 \sin{\left(2 x \right)}$$

      So, the result is: $- 4 \sin{\left(2 x \right)}$

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

      1. Let $u = 2 x$.

      2. The derivative of sine is cosine:

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

      3. Then, apply the chain rule. Multiply by $\frac{d}{d x} 2 x$:

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

            1. Apply the power rule: $x$ goes to $1$

            So, the result is: $2$

         The result of the chain rule is:

         $$2 \cos{\left(2 x \right)}$$

      So, the result is: $- 4 \cos{\left(2 x \right)}$

   The result is: $- 4 \sin{\left(2 x \right)} - 4 \cos{\left(2 x \right)}$

2. Now simplify:

   $$- 4 \sqrt{2} \sin{\left(2 x + \frac{\pi}{4} \right)}$$

The answer is:

$$- 4 \sqrt{2} \sin{\left(2 x + \frac{\pi}{4} \right)}$$