$3\cos\left(2x-40\right)-1$
$\left(h^2k^5\right)^4$
$\left(seny+xe^{xy}\right)dy=-\left(ye^{xy}\right)dx$
$\frac{1}{2}x^2-5x=18$
$-778+-191$
$8x+11<36$
$\left(2x+3\right)^2-\left(2x-3\right)^2+\left(3x-1\right)\left(3x+1\right)$
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