It's a graph that is a circle that is split up into percentages (%) and for different groups.
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Look on a unit circle graph and see what kind of pi it has. For example 90 degrees is pi/2
Arcsin
This depends on wether you want your answer in radians or degrees. If you want the answer in degrees, the highest and lowest point of the sin graph wil always be 90, 270, 450... and crosses the zero point at 180, 360, 540... If you want your answer in radians, the graph crosses the zero point, at pi, 2 pi, 3 pi... and has it's highest/lowest point at 1/2 pi, 1 1/2 pi, 2 1/2 pi...
it is just one tangent interval except sideways from left to right with domain or (-inf,+inf) and the range of (-pi/2,pi/2)
Yes, at k*pi radians (k*180 degrees) where k is any integer.