I NEED HELP FASSST!

plzzz answer this:
in the interval of 0 < x < 2pi
Anwser in radians, and a step to step answer would be even better

What are the major trends and specialties in psychology?

This is about this site if you answer enough questions can you get real money or not

Which of the following ideas would not lead to lower amounts of waste? a) the extension of a product’s lifetime b) the elimination of unnecessary packaging c) flexible construction for simple repair d) built-in obsolescence e) the introduction of new design technology