1.
Consider the following statements:
I. sin⁡−1(y2−4y+6)+cos⁡−1(y2−4y+6)=π2\sin^{-1} (y^2 - 4y + 6) + \cos^{-1} (y^2 - 4y + 6) = \frac{\pi}{2}, ∀y∈R\forall y \in \mathbb{R}
II. sec⁡−1(y2−4y+6)+cosec⁡−1(y2−4y+6)=π2\sec^{-1} (y^2 - 4y + 6) + \cosec^{-1} (y^2 - 4y + 6) = \frac{\pi}{2}, ∀y∈R\forall y \in \mathbb{R}
Which of the above statement(s) is/are true?