Use the Chain Rule to show that if is measured in degrees, then d/d (sin ) =

Use the Chain Rule to show that if is measured in degrees, then
d/dθ (sin θ) = π / 180 cos θ
(This gives one reason for the convention that radian measure is always used when dealing with trigonometric functions in calculus: The differentiation formulas would not be as simple if we used degree measure.)