Answer
(a) $ x=3\sin \theta $.
(b) $ x=4\sec \theta $.
(c) $ x=4\tan \theta $.
(d) $ x=\sqrt 5 \sec \theta $.
Work Step by Step
The required substitution choices are as follows:
(a) $ x=3\sin \theta $.
(b) $ x=4\sec \theta $.
(c) $ x=4\tan \theta $.
(d) $ x=\sqrt 5 \sec \theta $.
