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

The Law of Cosines (Cosine Rule) allows us to find angles, so arccosine is the proper function to use.