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JEE Main 2026 · MathsMultiple choiceSingle correctMediumMulti-step

JEE Main 4 April 2026, Shift 1, Maths Q1

Question 1 of 75 in this shift, Maths question 1 of 25, Section A.

Let

[\cdot]

denote the greatest integer function. If the domain of the function

f(x)=\cos^{-1}\left(\frac{4x+2[x]}{3}\right)

is

[\alpha,\beta]

, then

12(\alpha+\beta)

is equal to:

(1) $6$ Official answer
(2) $8$
(3) $9$
(4) $4$

Official answer

Option 1

NTA final key.

Chapter: Inverse Trigonometric Functions
Topic: Inverse Trig Domains
Idea tested: Inverse Trig with GIF and Fractional Part

Same idea in other shifts

Asked 2× in all

6 Apr 2026, Shift 1 · Q1Let $[\cdot]$ denote the greatest integer function. If the domain of the function $f(x)=\sin^{-1}\left(\frac{x+[x]}{3}\right)$ is…MediumSingle 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 42 of the 174 JEE Main shifts held from 2017 to 2026.