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JEE Mains · Maths · STD 12 - 7.2 definite integral

જો \(\int_0^{\frac{\pi}{3}} \cos ^4 x \mathrm{~d} x=\mathrm{a} \pi+\mathrm{b} \sqrt{3}\), જ્યાં \(\mathrm{a}\) અને \(\mathrm{b}\) સંમેય સંખ્યાઓ હોય, તો \(9 \mathrm{a}+8 \mathrm{~b} =\) ...........

  1. A \(2\)
  2. B \(1\)
  3. C \(3\)
  4. D  \(\frac{3}{2}\)
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Answer & Solution

Correct Answer

(A) \(2\)

Step-by-step Solution

Detailed explanation

\( \int_0^{\pi / 3} \cos ^4 x d x \) \( =\int_0^{\pi / 3}\left(\frac{1+\cos 2 x}{2}\right)^2 d x \) \( =\frac{1}{4} \int_0^{\pi / 3}\left(1+2 \cos 2 x+\cos ^2 2 x\right) d x \)…
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