47
RCMultiple Choice
Applying Vectors in the Plane — Cumulative exam
Question 47 • Precalculus
Solve the Law of Cosine: for cos C.
Answer
A
cosine C = StartFraction square of a + square of b minus square of c over 2ab EndFraction
B
cosine C = StartFraction square of a + square of b + square of c over negative 2ab EndFraction
C
cosine C = StartFraction square of c minus square of a minus square of b over 2ab EndFraction
D
cosine C = StartFraction square of negative c + square of a + square of b over negative 2ab EndFraction