Tích Phân

N

nguyenbahiep1

[laTEX]I = \int_{0}^{\frac{\pi}{2}}\frac{sinx}{\sqrt{3+cos^2x}} + \int_{0}^{\frac{\pi}{2}}\frac{sin2x}{\sqrt{3+cos^2x}} = I_1+I_2 \\ \\ I_1: cosx = t \Rightarrow dt =- sinx.dx \\ \\ I_2 : cos^2x +3 = t \Rightarrow dt = -2cosx.sinxdx = -sin2xdx [/laTEX]
 
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