$3\lim_{x\to45}\frac{1-\tan\left(x\right)}{\cos\left(x\right)-\sin\left(x\right)}$
$3x^2-24x+45$
$\:-\left(-8+6\right)-\left[-4+2-\left(-5+8\right)\right]$
$1-100sinx^2$
$8+2n$
$\frac{2x}{2}+\frac{x-2}{4}$
$\left(7b^2-3\right)^2$
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