what are the critical points, inflection points, intervals of increase/decrease and concavity in the following?

i used data from monthly weather averages to obtain the equation

69.74+19.33sin(o.4688x-1.7050)

what are the critical points, inflection points, intervals of increase/decrease and concavity?

also the absolute extremas!

i used data from monthly weather averages to obtain the equation

69.74+19.33sin(o.4688x-1.7050)

what are the critical points, inflection points, intervals of increase/decrease and concavity?

also the absolute extremas!