$-23+24-25-47-4+3$
$\left(\frac{\cos\left(b\right)\sec\left(b\right)}{\cot\left(b\right)}\right)\left(1-\sin^2\left(b\right)\right)$
$9\left(-6+9\right)+3\left(-2+4\right)$
$a^3-4a^2+6a-4$
$\sin x-\sin\left(x\right)\cos^2x$
$x^2+4x-6=0$
$\frac{x^3-9x^2\:+27x\:-27\:\:}{x-3}$
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