Teaching NVS PGT 2024 Test Series Mathematics Trigonometry Inverse Trigonometric Functions

Find the value of \(\rm \cos^{-1} (4x^3 - 3x)\), x ∈ [-1, 1]

1
3 cos-1 x
2
cos-1 3x
3
cos-1 x
4
None of the above
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