$4x^2-6xy+9x^2$
$\int\left(\frac{x^2+6x+6}{x^2}\right)dx$
$\left(2x+2\right)\left(a^2+b^3\right)$
$\left(1+\cos\left(x\right)\right)\left(1+\cos\left(x\right)\right)$
$sin\left(a\right)=0.31$
$24k-13k^2+12k^3$
$\int_0^1\left(xe^{x^2-1}\right)dx$
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