That requires neither engineering-level math nor paper nor patience. All you need is the chain rule and some basic knowledge of sine and cosine:
The derivative of cos is -sin, but because of the 6x you get an extra factor 6. The sine function is periodic on 2pi, so sin(6*2pi + pi/2) = sin(pi/2) = 1. So the result is -36
That requires neither engineering-level math nor paper nor patience. All you need is the chain rule and some basic knowledge of sine and cosine:
The derivative of cos is -sin, but because of the 6x you get an extra factor 6. The sine function is periodic on 2pi, so sin(6*2pi + pi/2) = sin(pi/2) = 1. So the result is -36
It’s called engineering level math because engineers, physicists, and math majors are required to take Calculus.
Yes I took calculus in high school but it’s not required. No I don’t remember much of any of it because it was decades ago.
You also learned all the countries/capitals in Africa when you were in middle school. But I bet you can’t name them now without Google. Same thing.