$\cos^2\left(x\right)+\cos^2\left(y\right)=1$
$x^2+x-11$
$36x^2+12xy+4y^2$
$x^2-82x+1600$
$\sin\left(x\right)\cos^2\left(y\right)-\cos\left(x\right)\sin\left(y\right)\frac{dy}{dx}=0$
$11a+14b-10a-12b+9$
$\lim_{x\to0}\ln\left(n\right)$
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