$47x^2+21x-28<\:0$
$\int2\senx\sqrt[3]{1+\cos x}dx$
$8x^3-18xy^2$
$\int4^{3x}dx$
$x^2+2y^2=13k^2$
$\sqrt{\frac{x-5}{x^6+5}}$
$0.7099759466766968\left(25^{\frac{1}{3}}+5^{\frac{1}{3}}+1\right)-4$
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