240 = 180 + 60
So the "related" angle to 240° is 60°
240° is in quadrant III, where only the tangent is positive.
so
sin240° = - sin60° = -√3/2
csc 240° = -2/√3
cos 240 = -cos60° = - 1/2
sec 240° = -2
tan 240° = √3
cot 240° = 1/√3
Your should know the basic side ratios, thus the trig ratios,
of the 30-60-90 ° and the 45-45 90 ° triangles.
That is how I got those answers
Determine the exact primary trig ratios of the angle 240 degrees.
help
2 answers
thank you ! this helped a lot!