Just question e iii) ? (1 Viewer)

[kasser]

attached below



Just e iii) the magnitude of an angle.

Is the working out for the angle like this

sin inverse -3/5 + sin inverse 12/13 = 104.25 degrees

However, this method does not work for cosine (a-b). It only worked for sine(a-b) and tangent (a-b)