$\lim_{x\to2}\left(\frac{x^4-x^3-8}{x^2+x-6}\right)$
$2\ln\left(x-3\right)-\ln\left(x^2-9\right)$
$\lim_{x\to0}\left(\frac{8^t-5^t}{t}\right)$
$5x^4-3x^3y;\:x=7;\:y=10$
$12.1+23.8+1.2+3.41$
$\left(x^2+2x+3\right)\left(2y^2-2y+5\right)$
$3x^2+42x=-24$
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