$\int_0^0\left(\frac{\cos\left(x\right)}{x}\right)dx$
$\left(k+3\right)^3$
$x^2-3x+7<4x-3$
$\int2x^3+5x^4dx$
$x=y^6$
$\frac{sin\left(x\right)^2+cos\left(x\right)^4-1}{cos\left(x\right)^2}$
$2a^2b-5cd^2;\:a=4;\:b=-7;c=-1;d=6$
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