$\sqrt{6x^2}-2y^2$
$\arcsin\left(\sin\left(\frac{7\pi}{4}\right)\right)$
$13a+20b-19+18b-26a$
$5y-3,22y+2,8$
$\frac{2\cos\left(x\right)^2-1}{\sin\left(x\right)\cdot\cos\left(x\right)}$
$x^2+3x<4$
$4 x ^ { 10 } - 36 \times 5 + 81$
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