$f\left(x\right)=\cos^34x^2$
$13^7$
$\left(1+2y\right)dx=\left(x^2-4\right)dy$
$2^2y^2-49y+81$
$15xy+5x$
$\lim_{x\to0}\left(\frac{1}{2x}e^{-\frac{3}{x^2}}\right)$
$\int x\cdot\cos\left(9x^2\right)dx$
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