$csc\:x\:-\:sin\:x\:=\:cos\:\left(-x\right)\:cot\:x\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\left(-2x^4y^2\right)^6$
$-4ab+2$
$-2x^2+2x+1$
$\left(8a-9b^4+5ab^2\right)\left(8a\:-9b^{4\:}-5ab^2\right)$
$\left(x^{\frac{1}{7}}\right)^2$
$3xy+4y=2x+2xy$
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