$x'-2x=t$
$\left(-4x\right)\left(-x^2+y^2+5\right)$
$\frac{1}{csc\left(x\right)+cot\left(x\right)}\:+\frac{1}{csc\left(x\right)-cot\left(x\right)}=2csc\left(x\right)$
$23.15-7.30$
$\frac{\cos\left(x\right)}{\sin\left(x\right)\:}$
$16x^2-y^2$
$-12,43+8,1$
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