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If two vectors A G and B G having equal magnitude R are inclined at an angle θ , then

1. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ θ = + 2 sin R 2 B A G G
2. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ θ = + 2 cos R 2 B A G G
3. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ θ = 2 sin R 2 B – A G G
4. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ θ = 2 cos R 2 B – A G G

Correct answer: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ θ = + 2 cos R 2 B A G G

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