$\frac{x^4+4x^3+3x^2-2x+2}{\left(x+1\right)\left(x^2+2x-1\right)}$
$\left(\frac{5}{x^2}\right)^3$
$\frac{3\cdot sin\left(x\right)sec\left(x\right)}{tan\left(x\right)}$
$\left(7x+6\right)x\:\left(7x-6\right)$
$\left(x^2+3x-10\right)\left(x^2-x-12\right)$
$1975-28$
$\sin^2x\left(1-\csc^2x\right)=-\cos^2x$
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