Trigonometry math question

Question

Which of the following expressions can be written as a single sine function of the form Asin⁡(Bt+θ)?

 3 sin⁡(2t)+5

cos⁡(2t)

cos⁡(πt) 

2 sin⁡(3t)+3

cos⁡(2t)

sin⁡(2t)+tan⁡(2t)

Answer 1

cos(pi*t) = sin (pi/2 - pi*t) = sin ( -pi*t + pi/2) so A=1,B=-pi and theta=pi/2