Posted by Jill on Friday, December 9, 2011 at 12:07pm.
These are a few standard angles whose trig values it will be worth your time to learn. It is easy to find a table of common angles , and these will be listed, along with pi/2 and 0
pi/6: sin = 1/2 cos = √3/2 tan = 1/√3
pi/4: sin = cos = 1/√2 tan = 1
pi/3: sin = √3/2 cos = 1/2 tan = √3
Note that the co-functions of complementary angles are the same as the functions of the angle. e.g.
sin pi/6 = cos pi/3 because pi/6 + pi/3 = pi/2
sin pi/4 = cos pi/4
and yes, csc = 1/sin
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