$\frac{1}{\sin\left(x\right)}+1+\frac{1-\sin\left(x\right)}{\sin\left(x\right)}$
$\frac{12x^2-7x-10}{3x+2}$
$\frac{25bc}{40abc}$
$\left(4x^8+9x^6\right)^2$
$2x-4\left(x-2\right)-6+3x-11$
$28+\left(+1\right)$
$\left(1-\:tan\left(x\right)\right)^2$
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