Boys meet phy-aqnu-etd

In the diagram of circle a what is m

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)