Evaluate (if possible) the sine, cosine, and tangent at the real number

Question

t = - 5π/6

Answer 1

-5pi/6= -150 degrees

sin(-5i/6)=-sin(pi/6)=-sin30= -1/2

cos(-5pi/6)= -sqr3/2

tan(-5pi/6)= 1/sqr3= sqr3/3