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Q.

If ‘ $x$ ’ is a negative real number then the value of $C o s^{- 1} x + S e c^{- 1} x$ is

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a

rational number

b

Irrational number

c

Integer

d

Imaginary

answer is B.

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Detailed Solution

$x = - 1$ only satisfies

$∴ C o s^{- 1} x + S e c^{- 1} x = π + π = 2 π$ , an irrational number

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