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Two vectors of equal magnitudes having a...

Two vectors of equal magnitudes having a sum of resultant equal to either of them, than the angel between them will be

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Let `vecPandvecQ` are two vectors of equal magnitude of value x and `vecR` is their resultant, then
`|vecP|=x,|vecQ|=x therefore |vecR|=x`
`because R^(2)=P^(2)+Q^(2)+2PQcostheta`
`therefore x^(2)=x^(2)+x^(2)+2x^(2)costheta`
`orcostheta=(1)/(2)`
`therefore theta=120^(@)`
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