$-5+15\cdot\left(-3\right)\cdot\left(-2\right)+6-\left(-9\right)\cdot\frac{2}{3}$
$4^{-1}-\left(2+8\right)^{-2}$
$10\cdot47.99$
$\left(8\right)^2^3^2$
$5x^2-10x+2=0$
$4\cos^2\left(x\right)=3$
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