$\left(1-\sin\right)\left(1+\tan^2\right)$
$x^2+y^2+z^2=2$
$a^2-c^2$
$3x-8c+2x-x$
$\left(-4\right)\left(-8\right)-3$
$4x\left(x+3\right)\ge-5$
$-x+1=3x+1$
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