$\left(6\right)\left(-3\right)\left(0\right)\left(9\right)$
$x^4-6x^3-5x^2+42x+40$
$\sqrt{3^2+2^2}$
$f\left(x\right)=7^2x+5x-3$
$-\frac{90}{3}$
$-x+21=3x+9$
$\cos\left(x\right)^3+\sin\left(x\right)^2\cos\left(x\right)$
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