Q.20. Assertion (A): The function 𝑓: 𝑅 − {(2𝑛 + 1) 𝜋 2 : 𝑛 ∈ 𝑍 } → (−∞, −1] ∪ [1, ∞) defined by f

Q.20. Assertion (A): The function 𝑓: 𝑅 − {(2𝑛 + 1)
𝜋
2
: 𝑛 ∈ 𝑍 } → (−∞, −1] ∪ [1, ∞) defined by
f x x ( ) = sec
is not one-one function in its domain.
Reason (R): The line
y = 2
meets the graph of the function at more than one point.