Posted by patrick on .
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,
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.