$\sqrt[4]{\left(-3\right)^4}$
$15.1-0.8$
$2x^8\cdot4x^3$
$\frac{\cos\left(10^{\circ}\right)}{cos20^{\circ}}+\frac{sen40^{\circ}}{sen70^{\circ}}$
$\int\frac{x-2}{\left(x^3-2x^2+x\right)}dx$
$8x^2+28x+20$
$\int4\sqrt{4-y^2}-ydy$
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