Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 2 - No. 4)
Which function is used for solving for the angle when applying the Law of Cosines?
arcsine
arccosine
arctangent
all of the above
Selitys
The Law of Cosines (Cosine Rule) allows us to find angles, so arccosine is the proper function to use.