Question

Which expression is equivalent to cos120°?

Answer 1

Option 1 - cos 240°

Explanation:

Answer 2

`-((1)/(2))`

Explanation:

The given expression is:

`cos120^(\circ)`

This expression can be rewritten as:

=
`cos(180-60)^(\circ)`

=
`-cos60^(\circ)`

=
`-((1)/(2))` (Because the value of
`cos60^(\circ)` is
`(1)/(2)`)

which is the required simplified expression.