$121x^4-4y^2$
$\lim_{x\to0}\left(\frac{n^k}{1.0000001^n}\right)$
$2\tan\left(x\right)\csc\left(2x\right)-\tan^2\left(x\right)$
$cos\left(x-\frac{4\pi}{3}\right)$
$22-4.\left(9+-3.2\right)=10$
$a^2y+7a^2y$
$\left(x^2+y^2\right)dx+xydy$
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