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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