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Find the derivative for the function:

$$F(x)=\int _{ \pi }^{ { x }^{ 2 } }{ \sin (t)dt } $$

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

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

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

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