Question

How do you solve `-6+10cosx=-1`?

Answer 1

The solution is `S={1/3pi+2kpi, 5/3pi+2kpi}`, `AA k in ZZ`

Explanation:

The equation is

`-6+10cosx=-1`

Rearranging the equation

`10cosx=-1+6=5`

`cosx=5/10=1/2`

`x=pi/3+2kpi` or `x=5/3pi+2kpi`, `AA k in ZZ`