I attached a file with this post these questions are for my son whos taking this coarse next month i want to prepare him so please i need the steps and answers
The first group of questions only require a scientific calculator.
The second set, at this point your text expects you to have an intimate knowlege of the special angles. Read This:
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Trig Values of Special AnglesCertain angles have trig values that may be computed exactly. Of these, the angles listed below are some of the angles most commonly used in math classes.
Exact Values of Trig Functions
See also
Special angles, trig functions, degrees, radians, sine, cosine, tangent, cosecant, secant, cotangent
You're jumping the gun wanting to get help with so many questions - questions that your son has yet to learn how to do at school. When your son starts learning this stuff (next month) this thread will make sense for him.
Until then, your son should be getting support in the things that he is currently learning or has already learned since that stuff will be getting built upon.