English

∫ X 3 Cos X 2 D X - Mathematics

Advertisements
Advertisements

Question

\[\int x^3 \cos x^2 dx\]
Sum
Advertisements

Solution

\[\int x^3 \cos x^2 \text{ dx }\]
\[\text{  Let x}^2 = t \]
\[ \Rightarrow 2x = \frac{dt}{dx}\]
\[ \Rightarrow dx = \frac{dt}{2x}\]
\[ = \frac{1}{2}\left[ \int t \text{ cos t dt } \right]\]
\[\text{Taking t as the first function and cos t as the second function} . \]
\[ = \frac{1}{2}\left[ t\sin t - \int\text{ sin t dt } \right]\]
\[ = \frac{1}{2}\left[ t\sin t + \cos t \right] . . . (1) \]
\[\text{Substituting the value of t in eq} \text{  (1) } \]
\[ = \frac{x^2 \sin x^2}{2} + \frac{\cos x^2}{2} + c\]

shaalaa.com
  Is there an error in this question or solution?
Chapter 19: Indefinite Integrals - Exercise 19.25 [Page 133]

APPEARS IN

RD Sharma Mathematics [English] Class 12
Chapter 19 Indefinite Integrals
Exercise 19.25 | Q 18 | Page 133

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

\[\int\frac{\left( 1 + \sqrt{x} \right)^2}{\sqrt{x}} dx\]

\[\int\frac{5 \cos^3 x + 6 \sin^3 x}{2 \sin^2 x \cos^2 x} dx\]

\[\int\frac{1}{1 + \cos 2x} dx\]

\[\int\frac{\left( x^3 + 8 \right)\left( x - 1 \right)}{x^2 - 2x + 4} dx\]

If f' (x) = 8x3 − 2xf(2) = 8, find f(x)


If f' (x) = a sin x + b cos x and f' (0) = 4, f(0) = 3, f

\[\left( \frac{\pi}{2} \right)\] = 5, find f(x)
 

\[\int\frac{x + 1}{x \left( x + \log x \right)} dx\]

\[\int\frac{\cos^5 x}{\sin x} dx\]

\[\int\frac{\cos\sqrt{x}}{\sqrt{x}} dx\]

\[\int\frac{\sec^2 \sqrt{x}}{\sqrt{x}} dx\]

\[\int\frac{x^5}{\sqrt{1 + x^3}} dx\]

\[\int \cot^n {cosec}^2 \text{ x dx } , n \neq - 1\]

\[\int \cot^5 \text{ x } {cosec}^4 x\text{ dx }\]

\[\int \cot^5 x  \text{ dx }\]

\[\int x \cos^3 x^2 \sin x^2 \text{ dx }\]

\[\int\frac{1}{\sqrt{1 + 4 x^2}} dx\]

 


\[\int\frac{1}{4 x^2 + 12x + 5} dx\]

\[\int\frac{1}{\sqrt{\left( x - \alpha \right)\left( \beta - x \right)}} dx, \left( \beta > \alpha \right)\]

\[\int\frac{x^2}{x^2 + 6x + 12} \text{ dx }\]

\[\int\frac{1}{4 \cos^2 x + 9 \sin^2 x}\text{  dx }\]

\[\int\frac{1}{4 \cos x - 1} \text{ dx }\]

\[\int\frac{1}{p + q \tan x} \text{ dx  }\]

\[\int\frac{\log \left( \log x \right)}{x} dx\]

` ∫    sin x log  (\text{ cos x ) } dx  `

\[\int \log_{10} x\ dx\]

\[\int\frac{x^2 \sin^{- 1} x}{\left( 1 - x^2 \right)^{3/2}} \text{ dx }\]

\[\int\sqrt{2x - x^2} \text{ dx}\]

\[\int\frac{x^2 + x - 1}{x^2 + x - 6} dx\]

\[\int\frac{18}{\left( x + 2 \right) \left( x^2 + 4 \right)} dx\]

\[\int\frac{\left( x^2 + 1 \right) \left( x^2 + 2 \right)}{\left( x^2 + 3 \right) \left( x^2 + 4 \right)} dx\]

 


\[\int\frac{1}{\left( x - 1 \right) \sqrt{2x + 3}} \text{ dx }\]

\[\int\frac{\left( 2^x + 3^x \right)^2}{6^x} \text{ dx }\] 

\[\int\sqrt{\sin x} \cos^3 x\ \text{ dx }\]

\[\int\frac{1}{4 x^2 + 4x + 5} dx\]

\[\int\frac{1}{x^2 + 4x - 5} \text{ dx }\]

\[\int\frac{1}{\left( \sin x - 2 \cos x \right) \left( 2 \sin x + \cos x \right)} \text{ dx }\]

\[\int\frac{1}{4 \sin^2 x + 4 \sin x \cos x + 5 \cos^2 x} \text{ dx }\]


\[\int\frac{1}{5 - 4 \sin x} \text{ dx }\]

\[\int\frac{\sin^6 x}{\cos x} \text{ dx }\]

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×