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## Homework Statement

Define x(t)=5cos(wt)+5cos(wt+120)+5cos(wt-120)

simplify x(t) into the standard sinusoidal form:x(t)= A cos(wt+phase).Use phasors to do the algebra.

## Homework Equations

## The Attempt at a Solution

i know it needs to use phasor addition rule.

First,i represent x1(t),x2(t),x3(t) by the phasors,and then add them together

however the result is 0,then i dont know to do

thanks a lot

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