The cosine of 60 degrees is also known as cos 60.
To understand this better, it’s useful to recall some fundamental trigonometric values. We know that:
- sin 30° = 1/2
- cos 60° = 1/2
This shows that sin 30° and cos 60° are actually equal. This is due to the co-function identities in trigonometry where:
sin(θ) = cos(90° – θ)
For our case:
sin 30° = cos (90° – 30°) = cos 60°
Thus, we can conclude:
cos 60° = 1/2
So, the relationship holds true that if sin 30° is 1/2, then cos 60° is also 1/2.