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Saturday, 31 October

JEE Main 2023 · MathsMultiple choiceSingle correctMediumCalculation

JEE Main 10 April 2023, Shift 1, Maths Q19

Question 19 of 90 in this shift, Maths question 19 of 30, Section A.

96cos⁡π33cos⁡2π33cos⁡4π33cos⁡8π33cos⁡16π3396\cos\frac{\pi}{33}\cos\frac{2\pi}{33}\cos\frac{4\pi}{33}\cos\frac{8\pi}{33}\cos\frac{16\pi}{33} is equal to
  1. (1)11
  2. (2)22
  3. (3)33Official answer
  4. (4)44

Official answer

Option 3

NTA final key.

Chapter
Trigonometric Functions
Topic
Trigonometric Identities
Idea tested
Product of Cosines with Doubling Angles

Same idea in other shifts

Asked 2× in all
  1. 25 Jul 2022, Shift 2 · Q19…HardSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.