Question

If t = -2π/3, evaluate (if possible) sin t, cos t, tan t

Answer 1

t = - 2 π / 3 = - 120° = 240°
From the unit circle:
sin t = - √ 3 / 2
cos t = - 1/2
tan t = sin t / cos t = ( - √3 / 2 ) : ( - 1/2 ) = √ 3