Mister Exam

Derivative of sqrt(x-2)sin(3x-2)

Function f() - derivative -N order at the point
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The solution

You have entered [src]
  _______             
\/ x - 2 *sin(3*x - 2)
x2sin(3x2)\sqrt{x - 2} \sin{\left(3 x - 2 \right)}
sqrt(x - 2)*sin(3*x - 2)
Detail solution
  1. Apply the product rule:

    ddxf(x)g(x)=f(x)ddxg(x)+g(x)ddxf(x)\frac{d}{d x} f{\left(x \right)} g{\left(x \right)} = f{\left(x \right)} \frac{d}{d x} g{\left(x \right)} + g{\left(x \right)} \frac{d}{d x} f{\left(x \right)}

    f(x)=x2f{\left(x \right)} = \sqrt{x - 2}; to find ddxf(x)\frac{d}{d x} f{\left(x \right)}:

    1. Let u=x2u = x - 2.

    2. Apply the power rule: u\sqrt{u} goes to 12u\frac{1}{2 \sqrt{u}}

    3. Then, apply the chain rule. Multiply by ddx(x2)\frac{d}{d x} \left(x - 2\right):

      1. Differentiate x2x - 2 term by term:

        1. Apply the power rule: xx goes to 11

        2. The derivative of the constant 2-2 is zero.

        The result is: 11

      The result of the chain rule is:

      12x2\frac{1}{2 \sqrt{x - 2}}

    g(x)=sin(3x2)g{\left(x \right)} = \sin{\left(3 x - 2 \right)}; to find ddxg(x)\frac{d}{d x} g{\left(x \right)}:

    1. Let u=3x2u = 3 x - 2.

    2. The derivative of sine is cosine:

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

    3. Then, apply the chain rule. Multiply by ddx(3x2)\frac{d}{d x} \left(3 x - 2\right):

      1. Differentiate 3x23 x - 2 term by term:

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

          1. Apply the power rule: xx goes to 11

          So, the result is: 33

        2. The derivative of the constant 2-2 is zero.

        The result is: 33

      The result of the chain rule is:

      3cos(3x2)3 \cos{\left(3 x - 2 \right)}

    The result is: 3x2cos(3x2)+sin(3x2)2x23 \sqrt{x - 2} \cos{\left(3 x - 2 \right)} + \frac{\sin{\left(3 x - 2 \right)}}{2 \sqrt{x - 2}}

  2. Now simplify:

    (6x12)cos(3x2)+sin(3x2)2x2\frac{\left(6 x - 12\right) \cos{\left(3 x - 2 \right)} + \sin{\left(3 x - 2 \right)}}{2 \sqrt{x - 2}}


The answer is:

(6x12)cos(3x2)+sin(3x2)2x2\frac{\left(6 x - 12\right) \cos{\left(3 x - 2 \right)} + \sin{\left(3 x - 2 \right)}}{2 \sqrt{x - 2}}

The graph
02468-8-6-4-2-1010-2020
The first derivative [src]
sin(3*x - 2)       _______             
------------ + 3*\/ x - 2 *cos(3*x - 2)
    _______                            
2*\/ x - 2                             
3x2cos(3x2)+sin(3x2)2x23 \sqrt{x - 2} \cos{\left(3 x - 2 \right)} + \frac{\sin{\left(3 x - 2 \right)}}{2 \sqrt{x - 2}}
The second derivative [src]
      ________                 3*cos(-2 + 3*x)   sin(-2 + 3*x)
- 9*\/ -2 + x *sin(-2 + 3*x) + --------------- - -------------
                                    ________               3/2
                                  \/ -2 + x      4*(-2 + x)   
9x2sin(3x2)+3cos(3x2)x2sin(3x2)4(x2)32- 9 \sqrt{x - 2} \sin{\left(3 x - 2 \right)} + \frac{3 \cos{\left(3 x - 2 \right)}}{\sqrt{x - 2}} - \frac{\sin{\left(3 x - 2 \right)}}{4 \left(x - 2\right)^{\frac{3}{2}}}
The third derivative [src]
  /      ________                 9*sin(-2 + 3*x)   3*cos(-2 + 3*x)   sin(-2 + 3*x)\
3*|- 9*\/ -2 + x *cos(-2 + 3*x) - --------------- - --------------- + -------------|
  |                                     ________               3/2              5/2|
  \                                 2*\/ -2 + x      4*(-2 + x)       8*(-2 + x)   /
3(9x2cos(3x2)9sin(3x2)2x23cos(3x2)4(x2)32+sin(3x2)8(x2)52)3 \left(- 9 \sqrt{x - 2} \cos{\left(3 x - 2 \right)} - \frac{9 \sin{\left(3 x - 2 \right)}}{2 \sqrt{x - 2}} - \frac{3 \cos{\left(3 x - 2 \right)}}{4 \left(x - 2\right)^{\frac{3}{2}}} + \frac{\sin{\left(3 x - 2 \right)}}{8 \left(x - 2\right)^{\frac{5}{2}}}\right)