see whch ones pass through (0,4)
remember, sin(0)=0 and cos(0)=1
hmm, so the first one works, 2nd works, 3rd doesn't, 4th does\
then find the min of each
wait, we can use what we know
the min of the cos and sin functions are all -1
so if we subsitute -1 for where we see sin(x) or cos(x) we see what we get
for first one, we get 3, so that works
2nd, we get 2, nope
4th, we get -4, nope
so the answer is A because it has a min at y=3 and passes through (0,4)
