$\lim_{h\to0}\frac{\left(\cosh\:^2\left(x+h\right)-\cosh^2\:\left(x\right)\right)}{h}$
$\sqrt{3xy^2}\sqrt[3]{2x^3y}$
$-2x^2+32x+30$
$2^2^2+3^2+1$
$-14k+\left(-7\right)k+15k$
$2x-4y=-2$
$\cos\left(2\left(\pi+x\right)\right)$
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