$\frac{2x+6}{2}-2x=3$
$3x^3-9x^2+6x^4$
$7-\left(8+5-3\right)+\left(-2-4\right)$
$36a^2-25c^4$
$4x^2+4x-6$
$6.\left(3.\right)\left(-9+4\left(5.3-9\right)\right)-3.\left(40-8\right)$
$\tan^2b=1$
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