Posted by patrick on Saturday, September 15, 2012 at 4:40pm.
find the reference angle of 20000 and express the six trigonometric functions of 20000 in terms of the six trigonometric functions of its reference angle.

trig  Reiny, Saturday, September 15, 2012 at 7:43pm
20000/360 = 55.555555..
= 55  200/360
so we have 55 clockwise rotations and then another clockwise rotation of 160°
OR
360200 = 160° in the counterclockwise of positive rotation direction
160° is in the second quadrant, where the sine is positve and we are 20° from the xaxis
so the reference angle is 20°
sin(20000) = sin20
cos(20000) = cos20
tan(20000( = tan(20)
I will let you do the cosecant, secant, and cotangents
test the above 3 with your calculator.
that is,
sin 20000  sin 20 should be zero, it is on mine.
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