$-7\cdot8\cdot9$
$3x-5^2$
$x^2+\frac{b}{a}x$
$\int\sec^62xdx$
$15+\left(-4\right)-\left(-8\right)+\left(+9\right)-\left(-5\right)+\left(-45\right)$
$4cos\left(x-\frac{\pi}{4}\right)+7=10$
$2x^2+5+x+2$
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