$\frac{9x^2}{16a^2}+\frac{xy}{a}+\frac{4y^2}{9}$
$2+\left(28\right)$
$\lim_{x\to0}\left(\cos\left(2x\right)\right)\frac{3}{x}$
$-a+b+2b+2c+3a+2c+3b$
$\lim_{x\to0}\left(\frac{e^2-1}{x}\right)$
$4x\cdot6x^4$
$\left(\frac{-6x^my^x}{3x^2y}\right)$
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