3. Vectors
Introduction to Dot Product (Scalar Product)
Problem 7 31 1 1
Open Question
Open Question(II) A→ and B→ are two vectors in the xy plane that make angles a and ᵦ with the x axis respectively. Evaluate the scalar product of A→ and B→ and deduce the following trigonometric identity: cos ( a and ᵦ) = cos a cosᵦ + sin a sin ᵦ.
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