Detail solution
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Apply the product rule:
; to find :
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Apply the power rule: goes to
; to find :
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Let .
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Apply the power rule: goes to
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Then, apply the chain rule. Multiply by :
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The derivative of sine is cosine:
The result of the chain rule is:
The result is:
Now simplify:
The answer is:
The first derivative
[src]
2 2
2*x*sin (x) + 2*x *cos(x)*sin(x)
$$2 x^{2} \sin{\left(x \right)} \cos{\left(x \right)} + 2 x \sin^{2}{\left(x \right)}$$
The second derivative
[src]
/ 2 2 / 2 2 \ \
2*\sin (x) - x *\sin (x) - cos (x)/ + 4*x*cos(x)*sin(x)/
$$2 \left(- x^{2} \left(\sin^{2}{\left(x \right)} - \cos^{2}{\left(x \right)}\right) + 4 x \sin{\left(x \right)} \cos{\left(x \right)} + \sin^{2}{\left(x \right)}\right)$$
The third derivative
[src]
/ / 2 2 \ 2 \
4*\- 3*x*\sin (x) - cos (x)/ + 3*cos(x)*sin(x) - 2*x *cos(x)*sin(x)/
$$4 \left(- 2 x^{2} \sin{\left(x \right)} \cos{\left(x \right)} - 3 x \left(\sin^{2}{\left(x \right)} - \cos^{2}{\left(x \right)}\right) + 3 \sin{\left(x \right)} \cos{\left(x \right)}\right)$$