$2cos^2\left(t\right)-cos\left(t\right)-1=0$
$\int\left(\frac{4y}{5x}\right)dx$
$\lim_{x\to2}\left(\frac{9x^2-4}{x}\right)$
$\left(b-3\right)\left(b-6\right)$
$2^{x+2}=8^{x-2}$
$\int\left(x^2+1\right)^6dx$
$54a^248a+9$
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