$15\tan^2a+14\tan a-8$
$5xy^2\left(9x^2-10y\right)$
$\left(2a-6d\right)^2$
$\frac{dy}{dx}\left(15x=15x+5y^3+3y^5\right)$
$\lim_{x\to+\infty}\left(x\ln\left(\frac{x+1}{x}\right)-2x\right)$
$4-5-6+6-2+14-23+16$
$x^2-2x-169$
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