posted by JOHN .
evaluate the trigonometric function of the given quadrantal angle.
subtract multiple of 360° (1400/360 = 3.8..
= tan320° , 320 is in IV and 40° from the x-axis
= cos π , (took away 4 multiples of 2π)
= cos π/2 (took away 6π)
= sin(-17π + 18π) , ( I added 9 rotations)
= sin π