Math miscellaneousHard

Question

If || = 4, || = 2 and the angle between and is π/6 then = 2 is equal to

Options

A.48
B.16
C.
D.none of these

Solution

We have, . = |||| cos = 4 × 2 × = 4√3.
Now, + = a2b2 ⇒ + 48 = 16 × 4 ⇒ = 16

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