Question

How do you solve `cosx+sqrt2=-cosx`?

Answer 1

`x=135`

Explanation:

`cosx+sqrt2=-cosx`
or
`cosx+cosx=-sqrt2`
or
`2cosx=-sqrt2`
or
`cosx=-sqrt2/2`
or
`cosx=-1/sqrt2`
or
`cosx=cos135`
or
`x=135`