$6\cdot\left(10+5\right)-\left(-4\right)\cdot2-\left(5-6\right)$
$16x^2-64x^2+64$
$\frac{x-2}{x-4}=\frac{3}{5}$
$\:21\left(6x\right)^3$
$( 2 a ^ { 3 } b ^ { 3 } ) ^ { - 4 } ( b ^ { - 1 } a ^ { 8 } ) ^ { 4 }$
$\frac{\sin^2\left(x\right)-cos\left(2x\right)+1}{cos^2\left(x\right)}$
$-1-2.\left(-3\right)$
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