a2−7a−44a2-7a-44a2−7a−44
∫−π2π2(15sin4(3x)cos(3x))dx\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}}\left(15\sin^4\left(3x\right)\cos\left(3x\right)\right)dx∫−2π2π(15sin4(3x)cos(3x))dx
2e−∞22e^{\frac{-\infty}{2}}2e2−∞
25x55x2\frac{25x^5}{5x^2}5x225x5
x2+y2=60x^2+y^2=60x2+y2=60
3x2−27<03x^2-27<03x2−27<0
x2+5x+24x^2+5x+24x2+5x+24
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