−18−(30−40+20)-18-\left(30-40+20\right)−18−(30−40+20)
5(a−b)+(a−b)+2(a−b)5\left(a-b\right)+\left(a-b\right)+2\left(a-b\right)5(a−b)+(a−b)+2(a−b)
xsen(y)dy=x2cos(y)dx xsen\left(y\right)dy=x^2cos\left(y\right)dx\:xsen(y)dy=x2cos(y)dx
∫4x2+4x2(x2+4)dx\int\frac{4x^2+4}{x^2\left(x^2+4\right)}dx∫x2(x2+4)4x2+4dx
2x2+4x+3=02x^2+4x+3=02x2+4x+3=0
logx(x)+31=2x\log_x\left(x\right)+31=2^xlogx(x)+31=2x
(x3)x2x3\frac{\left(x^3\right)}{x^2x^3}x2x3(x3)
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