$2xz+3x-12z-15z+7xz-13x$
$sin2x+2sina=\frac{-2sin^3x}{cosx-1}$
$-30-\left(-5\right)$
$3\sin^2x-\sin x-2=0$
$\frac{4x^2-9}{x+3}$
$1^2-2\cdot1\cdot2+4^2$
$13.456-5.134$
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