6x2y2+−x2y2+−9x2y26x^2y^2+-x^2y^2+-9x^2y^26x2y2+−x2y2+−9x2y2
4x−6x4x-6x4x−6x
x−1<3x+7x-1<3x+7x−1<3x+7
y′=3x23y2−4y'=\frac{3x^2}{3y^2-4}y′=3y2−43x2
−5(x+2)2-5\left(x+2\right)^2−5(x+2)2
2−7x≤162-7x\le162−7x≤16
y=3cos(2)xy=3\cos\left(2\right)xy=3cos(2)x
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