$\cos\left(3x\right)=-0.3$
$-7\cdot2+-8\cdot5$
$ku\cdot sin\left(x\right)\:=0$
$\cos^2x\:-\:\sin^2x$
$12+y+17+z$
$\frac{a^{-1}b}{2a^{-4}b^{-1}}$
$4x+1>5$
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