$-51-\left(-21\right)$
$\cot\left(10\right)\cos\left(10\right)+\sin\left(10\right)=\csc\left(10\right)$
$\frac{\left(sin\:4x\right)}{\left(4\right)}=\left(cos^3x\right)\left(sin\:x\right)-\left(sin^3x\right)\left(cos\:x\right)$
$\left(x^3+2x^2-5x+7\right)+\left(4x^3-5x^2+3\right)$
$e^xy\frac{dy}{dx}=1$
$\left(-3\right)\cdot\left(-7\right)+\left(-6\right)\cdot\left(+5\right)-3\left(-6+24-16\right)$
$\left(4x^3+5x-2\right)\left(3x^3+2x^2+5x-7\right)$
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