trig
posted by Anonymous .
Find the exact value. Without using a calculator
a) cos (17pi/6)
b) sec (3pi/2)

17/6 = 2 5/6
that is twice around counterclockwise then 5pi/6
that is pi/6 below x axis
and pi/6 = 180/6 = 30 deg
so 30 deg below x axis
cos of that is sqrt3/2
3 pi/2 is 180 + 90 = 270 or on y axis
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