$1+\cot^2x=3$
$765=x-254$
$3^0-3^4\cdot3^{-5}$
$25x-10+4$
$44axy-55bxy$
$5-\left|-\left(-6\right)-\left(-2\right)\right|\cdot2$
$\int10x\cdot sen\left(7x+7\right)dx$
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