$\left(\frac{2a}{5}+\frac{3b^3}{7}\right)^2$
$^{\left(a+4\right)}^2$
$4\cdot1-3$
$3\:+5\:-12\:-20\:+11\:+\:-4\:+13\:-6$
$\left(8x+7x^2\right)$
$\lim_{x\to0}\left(\frac{\sqrt{x-b}-\sqrt{a-b}}{x^2-a^2}\right)$
$\int y^3e^{3y}dy$
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