Detail solution
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The derivative of a constant times a function is the constant times the derivative of the function.
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The derivative of cosine is negative sine:
So, the result is:
The answer is:
The first derivative
[src]
$$- \frac{\sin{\left(x \right)}}{5}$$
The second derivative
[src]
$$- \frac{\cos{\left(x \right)}}{5}$$
The third derivative
[src]
$$\frac{\sin{\left(x \right)}}{5}$$