यदि \(\rm \displaystyle\int_{0}^{a} \frac{1}{1 + x^{2}}\: dx = \frac{\pi}{4}\) तो, a का मान ज्ञात करें ?

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

Answer (Detailed Solution Below)

Option 1 : 1
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अवधारणा:

समाकलन सूत्र

\(\rm \int \frac{dx}{{1 + x^{2}}} = tan^{-1} x + C\)

त्रिकोणमिति सूत्र

tan ( \(\rm \frac{\pi}{4}\) ) = 1

गणना:

दिया हुआ

⇒ \(\rm \int_{0}^{a} \frac{1}{1 + x^{2}}\: dx = \frac{\pi}{4}\)

⇒ \(\rm \left [tan^{-1}x \right ]_{0}^{a} = \frac{\pi }{4}\)

⇒ tan-1(a) - tan-1(0) = \(\rm \frac{\pi}{4}\)

⇒ tan-1(a) - 0 = \(\rm \frac{\pi}{4}\)

⇒ a = tan(\(\rm \frac{\pi}{4}\))

⇒ a = 1

a का मान 1 है

Additional Information

समाकलन सूत्र:

  • ∫ dx = x + C
  • ∫ a dx = ax+ C
  • \(\rm \int x^{n} dx = \frac{x^{n + 1}}{n + 1} + C \: (n \neq -1)\)
  • ∫ sin x dx = – cos x + C
  • ∫ cos x dx = sin x + C
  • ∫ sec2 x dx = tan x + C
  • ∫ cosec2 x dx = - cot x + C
  • ∫ sec x (tan x) dx = sec x + C
  • ∫ cosec x ( cot x) dx = – cosec x + C
  • ∫ (1/x) dx = ln |x| + C
  • ∫ ex dx = e+ C
  • \(\rm \int \frac{dx}{\sqrt{1 - x^{2}}} = sin^{-1} x + C\)
  • \(\rm \int \frac{dx}{{1 + x^{2}}} = tan^{-1} x + C\)
  • \(\rm \int \frac{dx}{x \sqrt{x^{2} - 1}} = sec^{-1} x + C\)

 

जहां C समाकलन का स्थिरांक है।
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