Answer:
[tex]-(\frac{1}{2})[/tex]
Step-by-step explanation:
The given expression is:
[tex]cos120^{\circ}[/tex]
This expression can be rewritten as:
=[tex]cos(180-60)^{\circ}[/tex]
=[tex]-cos60^{\circ}[/tex]
=[tex]-(\frac{1}{2})[/tex] (Because the value of [tex]cos60^{\circ}[/tex] is [tex]\frac{1}{2}[/tex])
which is the required simplified expression.
