$3\left(x+h\right)^2-\left(x+h\right)+6$
$\lim_{x\to0}\left(\frac{1-\sqrt{\cos\left(x\right)}}{\cos\left(3x\right)-\cos\left(x\right)}\right)$
$-3.00\cdot30$
$\left(2x^2y^7-1\right)\left(2x^2y^7+1\right)$
$\lim_{x\to90}\left(x-90\right)\cdot\tan\left(x\right)$
$6a^4-9a^4+12a^2-15a$
$-x+\frac{2}{3}\ge x+1$
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