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Q.

If P+Q=R and |P|=|Q|=3 and |R|=3, then the angle betweenP and Q is

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a

π/4

b

π.6

c

π/3

d

π/2

answer is C.

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Detailed Solution

3=(3)2+(3)2+2(3)(3)cosθ⇒θ=60°
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