$10k+1+8k+2$
$f\left(x\right)=\frac{2x^2-4x}{x^3+5x+3}$
$\frac{42x^5-8x^3+15}{6x^3+3}$
$y+4+x+8$
$\frac{d^2}{dx^2}\tan\left(x\right)$
$-5.9\:+\:9.3$
$3\sqrt{2}+7\sqrt{2}-5\sqrt{2}$
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