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Ex 2.2, 13 (MCQ) - Find cos^-1(cos 7pi/6) is equal to (A) 7pi/6

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Ex 2.2, 13Find the values of cos−1(cos 7π/6) is equal to(A) 7π/6 (B) 5𝜋/6 (C) 𝜋/3 (D) 𝜋/6Let y = cos−1 (cos 7π/6) cos y = cos (7π/6) cos y = cos (210°)Since Range of of cos−1 is [0, π] i.e. [0° ,180°]Hence, y = 210° not possible Now, cos

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