$\lim_{x\to0}\left(\frac{7}{x}-\frac{3}{x^2}\right)$
$2a\left(4+a^2\right)$
$x^2y'=2xy+3$
$\left(9\right)+\left(-13\right)-\left(-12\right)$
$2\sin^2\left(x\right)=5\sin\left(x\right)-3$
$(\sec\left(x\right)+\tan\left(x\right))^2$
$\left(x-y+7\right)+\left(x-y+1\right)$
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