Q.

If ‘x’ is a negative real number then the value of Cos−1x+Sec−1x 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 ∴Cos−1x+Sec−1x=π+π=2π, an irrational number
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If ‘x’ is a negative real number then the value of Cos−1x+Sec−1x is