$\left(1-\cos a\right)\left(\left(1+cos\:a\right)\right)=\sin^2a$
$8x+1=-23$
$81-36x^2+72x$
$\frac { x ^ { 4 } - 3 x - 5 } { x - 2 }$
$\frac{16y^7-24y^5+40x^4}{8y^2}$
$\left(2r-s\right)\left(2r+s\right)$
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