$cosx\left(1+secx\right)\left(cosx-1\right)$
$\left(3x^2+x-18\right)\left(2x+4\right)$
$-81x^4+9$
$\lim_{t\to0}\left(\frac{10e^{t}-10}{t^{3}}\right)$
$\log_a\left(3x+5\right)-\log_a\left(x-5\right)=\log_a\left(8\right)$
$-4-4y+6y$
$\frac{d^3y}{dx^3}\left(y=e^x\left(5x+2\right)\right)$
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