đặt \(x^2+2x+3=u\Rightarrow du=\left(2x+2\right)dx\)
và \(cosxdx=dv\Rightarrow v=-sinx\)
\(\int\left(x^2+2x+3\right)cosxdx=-sinx\left(x^2+2x+3\right)+2\int\left(x+1\right)sinxdx\) xét \(\int\left(x+1\right)sinxdx=\left(x+1\right)cosx-\int cosx.dx=cosx\left(x+1\right)+sinx\)
vậy \(\int\left(x^2+2x+3\right)cosxdx=-sinx\left(x^2+2x+3\right)+2cossx\left(x+1\right)+2sinx+C\)
1, \(\int\dfrac{x}{1-cos2x}dx\)
2, \(\int cos2x.e^{3x}dx\)
3, \(\int\left(2x+1\right)ln^2dx\)
4, \(\int\left(2x-1\right)cosxdx\)
5, \(\int\left(x^2+x+1\right)e^xdx\)
6, \(\int\left(2x+1\right)ln\left(x+2\right)dx\)
Tính nguyên hàm các hàm số sau:
1. \(I=\int\dfrac{cos^2x}{sin^8x}dx\)
2. \(I=\int\left(e^{sinx}+cosx\right)cosxdx\)
Tìm các nguyên hàm sau
1.\(\int\frac{9x^2}{\sqrt{1-x^3}}dx\)
2.\(\int\frac{1}{\sqrt{x}\left(1+\sqrt{x}\right)^3}dx\)
3.\(\int\frac{x}{\sqrt{2x+3}}dx\)
4.\(\int\) \(\frac{e^{2x}}{\sqrt{1+e^x}}\) dx
5.\(\int\frac{\sqrt[3]{1+lnx}}{x}dx\)
6.\(\int\) cosxsin3xdx
7.\(\int\) (x2+2x-1)exdx
8.\(\int\) excosxdx
9.\(\int\) xsin(2x+1)dx
10.\(\int\) (1-2x)e3xdx
Tính các nguyên hàm sau :
a) \(\int x\left(3-x\right)^5dx\)
b) \(\int\left(2^x-3^x\right)^2dx\)
c) \(\int x\sqrt{2-5x}dx\)
d) \(\int\dfrac{\ln\left(\cos x\right)}{\cos^2x}dx\)
e) \(\int\dfrac{x}{\sin^2x}dx\)
\(\int\dfrac{x+1}{\left(x-2\right)\left(x+3\right)}dx\)
h) \(\int\dfrac{1}{1-\sqrt{x}}dx\)
i) \(\int\sin3x\cos2xdx\)
k) \(\int\dfrac{\sin^3x}{\cos^2x}dx\)
l) \(\int\dfrac{\sin x\cos x}{\sqrt{a^2\sin^2x+b^2\cos^2x}}dx\) (\(a^2\ne b^2\))
1, \(\int\dfrac{lnxdx}{\sqrt{x}}\)
2, \(\int ln\left(x+\sqrt{x^2+1}\right)dx\)
3, \(\int\left(x^2+2x+3\right)dx\)
\(\int\frac{x}{\left(1+2x\right)^3}dx\)
\(\int\frac{1-x^2}{x+x^3}dx\)
Tìm nguyên hàm các hàm số hữu tỉ sau :
a) \(\int\frac{x^2+2x-1}{\left(x-1\right)\left(x^2+1\right)}dx\)
b) \(\int\frac{x^2+1}{\left(x-1\right)^3\left(x+3\right)}dx\)
Tìm nguyên hàm của các hàm số sau:
a) \(\int\left(6x-\dfrac{1}{sin^2x}+1\right)dx\)
b) \(\int\dfrac{x^3+2x^2-1}{x^2}dx\)
\(\int\sqrt{x}\left(2x-3\sqrt[3]{x^2}-1\right)dx\)
