Explanation:
Calculate sin(70)°
Determine quadrant:
Since our angle is between 0 and 90 degrees, it is located in Quadrant I In the first quadrant, the values for sin, cos and tan are positive.
Determine angle type:
70 is an acute angle since it is less than 90°
sin(70) = 0.93969262030844
Write sin(70) in terms of cos
Since 70° is less than 90,
we can express this in terms of a cofunction
sin(θ) = cos(90 - θ)
sin(70) = cos(90 - 70)
sin(70) = cos(20)