When proving that (1-cosθ)/θ tends to 0 as θ goes to 0 in the geometric interpretation, shouldn't he be using 2θ in place of θ, as he duplicated the theta when he mirrored it upon what looks to be the x-axis? Also why does he look to be using what looks to me like sinθ (the green line that signifies the height of a specific point on the unit circle) when proving that the numerator of the function decreases significantly "faster" than the denomonator, as θ should be the length of the arc from 0 to a specific angle on the unit circle?####[['(1-cosθ)/θ', 'Mathematical_Related_Concept', 'NEG'], ['sinθ', 'Mathematical_Related_Concept', 'NEG'], ['NULL', 'Instructor', 'NEU'], ['θ', 'Mathematical_Related_Concept', 'NEG']]