Which of the following functions represent SHM? (I) y = sin ωt - cos ωt (II) y = sin^3 t

Question

Which of the following functions represent SHM?

(I) y = sin ωt = cos ωt

(II) y = sin²t

(III) y = 5 cos \((\frac{3π}{4} - 3ωt)\)

(IV) y = 1 + ωt + ω²t²

(a) I and III 

(b) I and II 

(c) only I 

(d) I, II and III

Answer 1

(a) I and III