Question

Which of the following is the principal value branch of cosec^-1 x?

(a) (-π/2, π/2) 

(b) [0, π] – {π/2} 

(c) [-π/2, π/2] 

(d) [-π/2, π/2] – {0}

Answer 1

(d) [-π/2, π/2] – {0}

As the principal branch of cosec^-1 x is [-π/2, π/2] – {0}.