first find which ones pass through (0,4)
sin(0)=0
cos(0)=1
so the only one that doesn't pass through (0,4) is the 3rd one
min value
well, the last one doesn't even pass through (3pi/2,3)
ok, min or max
we know it repeats every 2pi so test pi and see if it is below or over
sin(pi)+4=4, 4>3 so that is the min
-3sin(pi)=0, 0<3 so that is not the min of this one
answer is fist one
