Advertisements
Advertisements
Question
Verify the following:
`int (x - 1)/(2x + 3) "d"x = x - log |(2x + 3)^2| + "C"`
Advertisements
Solution
L.H.S. = `int (2x - 1)/(2x + 3) "d"x`
⇒ `int (1 - 4/(2x + 3)) "d"x` .....[Dividing the numerator by the denominator]
⇒ `int 1 * "d"x - 4 int 1/(2x + 3) "d"x`
⇒ `int 1 * "d"x - 4/2 int 1/(x + 3/2) "d"x`
⇒ `int 1 * "d"x - 2 int 1/(x + 3/2) "d"x`
⇒ `x - 2 log |x + 3/2| + "C"`
⇒ `x - 2 log |(2x + 3)/2| + "C"`
⇒ `x - log|((2x + 3)/2)^2| + "C"` ....[∵ n log m = log mn]
⇒ `x - log |(2x + 3)^2| - log 2^2 + "C"`
⇒ `x - log |(2x + 3)^2| + "C"_1`
⇒ R.H.S. ......[Where C1 = C – log 22]
L.H.S. = R.H.S.
Hence proved.
APPEARS IN
RELATED QUESTIONS
\[\int\limits_{\pi/4}^{\pi/2} \cot x\ dx\]
Evaluate each of the following integral:
If \[\int_0^a \frac{1}{4 + x^2}dx = \frac{\pi}{8}\] , find the value of a.
The value of the integral \[\int\limits_0^{\pi/2} \frac{\sqrt{\cos x}}{\sqrt{\cos x} + \sqrt{\sin x}} dx\] is
If \[\int\limits_0^a \frac{1}{1 + 4 x^2} dx = \frac{\pi}{8},\] then a equals
\[\int\limits_0^1 \tan^{- 1} x dx\]
\[\int\limits_0^{1/\sqrt{3}} \tan^{- 1} \left( \frac{3x - x^3}{1 - 3 x^2} \right) dx\]
\[\int\limits_0^1 \left| \sin 2\pi x \right| dx\]
\[\int\limits_1^3 \left| x^2 - 4 \right| dx\]
\[\int\limits_0^{\pi/2} \frac{1}{1 + \tan^3 x} dx\]
\[\int\limits_0^{15} \left[ x^2 \right] dx\]
\[\int\limits_0^{\pi/2} \frac{x \sin x \cos x}{\sin^4 x + \cos^4 x} dx\]
\[\int\limits_0^\pi \cos 2x \log \sin x dx\]
\[\int\limits_{- \pi}^\pi x^{10} \sin^7 x dx\]
\[\int\limits_0^\pi \frac{dx}{6 - \cos x}dx\]
\[\int\limits_0^{\pi/2} \frac{1}{2 \cos x + 4 \sin x} dx\]
\[\int\limits_0^{\pi/2} \frac{dx}{4 \cos x + 2 \sin x}dx\]
\[\int\limits_{- 1}^1 e^{2x} dx\]
Using second fundamental theorem, evaluate the following:
`int_1^2 (x "d"x)/(x^2 + 1)`
Evaluate the following:
`int_(-1)^1 "f"(x) "d"x` where f(x) = `{{:(x",", x ≥ 0),(-x",", x < 0):}`
Evaluate the following using properties of definite integral:
`int_0^1 x/((1 - x)^(3/4)) "d"x`
Choose the correct alternative:
Γ(1) is
Choose the correct alternative:
`int_0^oo x^4"e"^-x "d"x` is
Which notation represents a definite integral?
