Please I need help with these questions!

1. tell the amplitude, horizontal shift and vertical shift of

y = 2*cos(3x - pi/2) + 4

2. Find the exact value of the vertical asymptotes for 0<x<pi for the function

y = cot(3x)

3. List the exact amplitude, period and horizontal shift for

y = 2*tan(pi*x + 3)

4. Identif all vertical asymptotes for 0<x<2pi

y = tan(2x - pi/4)

Thank you so much!