Question

Which of these is equal to sin(70 degrees)

Answer 1

recall that the sin of a value, is the y value of the point on the unit circle

Answer 2

so for 70 degrrees (first quadrant) you know that the sin(70) will be a positive number

Answer 3

also: From symmetry

Sin(70) = Cos(90 - 70) = cos(20)

Answer 4

and

sin(180 - 70) = sin(70)