Question

How do you find the general solutions for `sqrt(2) cos x + 1 = 0`?

Answer 1

Solve sqrt2cos x + 1 = 0
Ans: `+- (3pi)/4`

Explanation:

`sqrt2cos x = -1`
`cos x = -1/(sqrt2) = -sqrt2/2` --> `x = +- (3pi)/4`

`x = +- (3pi)/4 + 2kpi`