ExamBro
ExamBro
CUET · MATHS · PYQ PAPER 2023

Find the maximum value of the function sin x(1 + cos x) is:

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

Answer & Solution

Correct Answer

(A) \(\frac{3 \sqrt{3}}{4}\)

Step-by-step Solution

Detailed explanation

\(f(x) = \sin x (1 + \cos x)\) \(f'(x) = \cos x (1 + \cos x) + \sin x (-\sin x)\) \(f'(x) = \cos x + \cos^2 x - \sin^2 x = \cos x + \cos(2x)\) \(f'(x) = 0 \implies \cos x + 2\cos^2 x - 1 = 0\) \((2\cos x - 1)(\cos x + 1) = 0\) \(\cos x = \frac{1}{2}\) or \(\cos x = -1\) For…
From CUET
Explore more questions on app