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JEE Mains · Maths · STD 12 - 7.1 indefinite integral

माना \(I_{n}=\int \tan ^{n} x d x,(n > 1)\) है। यदि \(I_{4}+I_{6}=a \tan ^{5} x+b x^{5}+C\) है, जहाँ \(C\) एक समाकलन अचर है, तो क्रमित युग्म \((a, b)\) बराबर है:

  1. A \(\left( { - \frac{1}{5},0} \right)\)
  2. B \(\left( { - \frac{1}{5},1} \right)\)
  3. C \(\left( {\frac{1}{5},0} \right)\)
  4. D \(\left( {\frac{1}{5}, - 1} \right)\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\left( {\frac{1}{5},0} \right)\)

Step-by-step Solution

Detailed explanation

\(I_{n}=\int \tan ^{n} x d x, n>1\) \(\text { Let } \mathrm{I}=\mathrm{I}_{4}+\mathrm{I}_{6}\) \(=\int\left(\tan ^{4} x+\tan ^{6} x\right) d x\) \(=\int \tan ^{4} x \sec ^{2} x d x\) \(\text { Let } \tan x=t\) \(\Rightarrow \sec ^{2} x d x=d t\) \(\therefore I=\int t^{4} d t\)…
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