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Three vectors of equal magnitude are sho...

Three vectors of equal magnitude are shown in figure. Find angle `theta` formed by ` vec(a) + vec(b) - vec(c)` with x-axis, `tan(theta)` = ?

A

`(sqrt(6) + 1)/(sqrt(2) - 1)`

B

`(sqrt(6) - 1)/(sqrt(2) + 1)`

C

`1/(sqrt(2)`

D

`(sqrt(2) - 1)/(sqrt(6) + 1)`

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