−4x2+16x+20+9y2=0-4x^2+16x+20+9y^2=0−4x2+16x+20+9y2=0
13513^5135
∫(51+9x2)dx\int\left(\frac{5}{1+9x^2}\right)dx∫(1+9x25)dx
2cos4π7x=22cos\frac{4\pi}{7}x=\sqrt{2}2cos74πx=2
(x−2)2en+7\frac{\left(x-2\right)^2}{e^{n+7}}en+7(x−2)2
3x2−1x3−3\frac{3x^2-1}{x^3-3}x3−33x2−1
−8x3(−9x5+x4−1)-8x^3\left(-9x^5+x^4-1\right)−8x3(−9x5+x4−1)
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