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Q.

If a and b are two units vectors inclined at an angle of 60° to each other, then

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a

|a+b|>1

b

|a+b|<1

c

|a-b|>1

d

|a-b|<1

answer is A.

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Detailed Solution

|a+b|=2Acosθ2=(2)(1)cos30°=3|a-b|=2Acosθ2=(2)(1)cos30°=1
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