Find the Cosine of the Angle Between the Two Vectors $\langle 1,2 \rangle$

question 165

Multiple Choice

Find the cosine of the angle between the two vectors $\langle 1,2 \rangle$ and $\langle - 2,1 \rangle$ .

• A) \(\frac { 1 } { \sqrt { 2 } }\)
• B)0
• C) \(\frac { 1 } { \sqrt { 3 } }\)
• D)1
• E) \(\frac { 1 } { \sqrt { 5 } }\)
• F) \(\frac { 1 } { 2 }\)
• G) \(\frac { 4 } { 3 }\)
• H) \(\frac { 3 } { 4 }\)

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