x2+4x=−2x^2+4x=-2x2+4x=−2
28−a=a−1228-a=a-1228−a=a−12
∫(12v(7+6v2)9)dv\int\left(12v\left(7+6v^2\right)^9\right)dv∫(12v(7+6v2)9)dv
−27xy236yz-\frac{27xy^2}{36yz}−36yz27xy2
3x2+25x−30≤03x^2+25x-30\le03x2+25x−30≤0
−3−2⋅(−7)+4(−5)−3⋅(−2)+7⋅(−3)-3-2\cdot\left(-7\right)+4\left(-5\right)-3\cdot\left(-2\right)+7\cdot\left(-3\right)−3−2⋅(−7)+4(−5)−3⋅(−2)+7⋅(−3)
cosx⋅sec(−x)cosx\cdot sec\left(-x\right)cosx⋅sec(−x)
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