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JEE Main202131 Aug 2021Morning ShiftMathematicsLimitsActual

lim x → 0 sin 2 π cos 4 x x 4 is equal to :

Options

  1. A2 π 2
  2. Bπ 2
  3. C4 π 2
  4. D4 π

Correct answer

C. 4 π 2

Step-by-step solution

Given that lim x → 0 sin 2 π 1 - sin 2 x 2 x 4 = lim x → 0 sin 2 π 1 + sin 4 x - 2 sin 2 x x 4 = lim x → 0 sin 2 π - π 2 sin 2 x - sin 4 x x 4 = lim x → 0 sin 2 π 2 sin 2 x - sin 4 x x 4 = lim x → 0 sin π 2 sin 2 x - sin 4 x π 2 sin 2 x - sin 4 x 2 · π 2 2 sin 2 x - sin 4 x 2 x 4 When x   →   0   ⇒ 2 sin 2 x   -   sin 4 x   →   0   Let k   =   2 sin 2 x   -   sin 4

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