# Calculus - Dot Product

posted by
**Shaila**
.

consider a rhombus ABCD

a) find the resultant of vector AB + vector AD and vector AB - vector AD? (cosine rule)

b) What will be the value of the dot product of vector AB + vector AD and vector AB - vector AD always be? (always zero)

c) Is this value of the dot product of vector AB - vector AD dot product vector AB + vector AD (commutative property)

Can someone please check if the answers in the brackets are correct!!!