$4\sin\left(x\right)\sin\left(y\right)+\cos\left(y\right)\frac{dy}{dx}=0$
$4z^2-36z+81$
$y-7=x^2+9x+\frac{81}{4}$
$-32+-45-2$
$\lim_{x\to0}\left(\frac{e^{2x}-1}{sin\cdot2x}\right)$
$\sqrt{y+20}=y$
$\frac{10}{\sqrt{6-x}.\sqrt{x+4}}=2$
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