Solve the equation

(i) \(4\sin\left(3x-\dfrac{\pi}{4}\right)=3\) for \(0\leqslant x\leqslant \dfrac{\pi}{2}\) radians,

(ii) \(2\tan^2 y+\operatorname{sec}^2 y=14\operatorname{sec} y+3\) for \(0^\circ\leqslant y\leqslant 360^\circ\).