$2\sqrt{2}\cos\left(x\right)-4\sin\left(x\right)\cos\left(x\right)$
$\int_0^{\frac{\pi\:}{6}}\:cos4x\cdot sin2xdx$
$x ^ { 2 } + 3 x > 4$
$\log\left(9x+1\right)-2=0$
$\left(8y\:-\:3x^2\right)^2$
$36\:-\:12\:\left(\:y\:-1\:\right)\:+\:\left(\:y\:-\:1\:\right)$
$x-x^2-x^3$
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