Mister Exam

Derivative of y=sin(x)+tg(x)-ctg(x)

Function f() - derivative -N order at the point
v

The graph:

from to

Piecewise:

The solution

You have entered [src]
sin(x) + tan(x) - cot(x)
$$\left(\sin{\left(x \right)} + \tan{\left(x \right)}\right) - \cot{\left(x \right)}$$
sin(x) + tan(x) - cot(x)
Detail solution
  1. Differentiate term by term:

    1. Differentiate term by term:

      1. The derivative of sine is cosine:

      2. Rewrite the function to be differentiated:

      3. Apply the quotient rule, which is:

        and .

        To find :

        1. The derivative of sine is cosine:

        To find :

        1. The derivative of cosine is negative sine:

        Now plug in to the quotient rule:

      The result is:

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

      1. There are multiple ways to do this derivative.

        Method #1

        1. Rewrite the function to be differentiated:

        2. Let .

        3. Apply the power rule: goes to

        4. Then, apply the chain rule. Multiply by :

          The result of the chain rule is:

        Method #2

        1. Rewrite the function to be differentiated:

        2. Apply the quotient rule, which is:

          and .

          To find :

          1. The derivative of cosine is negative sine:

          To find :

          1. The derivative of sine is cosine:

          Now plug in to the quotient rule:

      So, the result is:

    The result is:

  2. Now simplify:


The answer is:

The graph
The first derivative [src]
       2         2            
2 + cot (x) + tan (x) + cos(x)
$$\cos{\left(x \right)} + \tan^{2}{\left(x \right)} + \cot^{2}{\left(x \right)} + 2$$
The second derivative [src]
            /       2   \            /       2   \       
-sin(x) - 2*\1 + cot (x)/*cot(x) + 2*\1 + tan (x)/*tan(x)
$$2 \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} - 2 \left(\cot^{2}{\left(x \right)} + 1\right) \cot{\left(x \right)} - \sin{\left(x \right)}$$
The third derivative [src]
                         2                  2                                                    
            /       2   \      /       2   \         2    /       2   \        2    /       2   \
-cos(x) + 2*\1 + cot (x)/  + 2*\1 + tan (x)/  + 4*cot (x)*\1 + cot (x)/ + 4*tan (x)*\1 + tan (x)/
$$2 \left(\tan^{2}{\left(x \right)} + 1\right)^{2} + 4 \left(\tan^{2}{\left(x \right)} + 1\right) \tan^{2}{\left(x \right)} + 2 \left(\cot^{2}{\left(x \right)} + 1\right)^{2} + 4 \left(\cot^{2}{\left(x \right)} + 1\right) \cot^{2}{\left(x \right)} - \cos{\left(x \right)}$$
The graph
Derivative of y=sin(x)+tg(x)-ctg(x)