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Q.

Two vectors a→ and b→ are at an angle of 60o with each other. Their resultant makes an angle of 45o with a→ .If |b→|=2 units, then |a→| is

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a

3

b

3−1

c

3+1

d

3/2

answer is B.

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Detailed Solution

tan⁡45∘=2sin⁡60∘a+2cos⁡60∘=3a+1 or  1=3a+1 or a+1=3 or a=3−1
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