$\frac{dy}{dx}=\cos^{-1}\left(\sqrt{x}\right)$
$\lim_{x\to0}\left(\cos\left(2x\right).\sin\left(6x\right)\right)$
$3\sqrt[3]{a^2}$
$6\cdot3x$
$\ln\left(9x-2\right)=\ln\left(x+14\right)$
$x^2+2x^2y+3xy=0$
$\lim_{x\to-5}\left(\frac{x^2+9x+20}{40-3x+x^2}\right)$
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