T(z)= sin^2(z/4), {-3 ≤ z ≤ 8} identify the intervals where:
a) T(z) is increasing
b)T(z) is decreasing
C)T(z) is concave up
d)T(z) is concave down
Then identify the
e) absolute minimum and where it is
f) A relative maximum ( not absolute maximum and where it is

please help