∫63sec(9x)tan(9x)dx\int63\sec\left(9x\right)\tan\left(9x\right)dx∫63sec(9x)tan(9x)dx
12x+4\frac{1}{2\sqrt{x+4}}2x+41
limx→∞(ncos(nπ)2n−1)\lim_{x\to\infty}\left(\frac{n\cos\left(n\pi\right)}{2n-1}\right)x→∞lim(2n−1ncos(nπ))
y=ln3x+4y=\ln\sqrt{3x+4}y=ln3x+4
ddxtan(ex)\frac{d}{dx}\tan\left(e^x\right)dxdtan(ex)
dydx−yx=lnx2\frac{dy}{dx}-\frac{y}{x}=lnx^2dxdy−xy=lnx2
y′+3xy3=0y'+3xy^3=0y′+3xy3=0
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