$\tan\left(x\right)^2=15$
$6x^2+2x-3x^2-1$
$tanxcsox+tanx=0$
$4x^2+2x+36$
$5^0+4^2-2^3$
$-x\cdot1\cdot x^2+1$
$\lim_{x\to-5}\left(\frac{x^2+3x-10}{x^2+10x+25}\right)$
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