$9x^2+4y^2=36$
$\left(\frac{x^2}{y^2}\right)x$
$\left(5x-9y\right)^2$
$\cot=0.2$
$\int\left(x\left(x-5\right)^2\right)dx$
$\cos\left(3x\right)=-0.3$
$c^2+8c+16$
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