I need help please - Pre-Calc

Using the graph of y=cos(x), list all values of x on the interval [-11π/3,11π/6] that satisfy the ordered pair of (x,-1/radical2).

- List all the values of (x,-1/radical2)

(Type an exact answer using π as needed. Use a comma to separate answers as needed. Use integers or fractions for any numbers in the​ expression.)

- Please, ​someone, ​help me. Show work step by step so that I can learn it. I have no idea where to start, so please be specific on the steps on how to solve it. Thank You

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  1. 1/√2 is the cosine of 45º (π/4)
    ... that is the reference angle

    -1/√2 is the cosine of
    ... ±3π/4
    ... add or subtract multiples of 8π/4 to find the values on the interval

    x values...-13π/4, -11π/4, -5π/4, -3π/4, 3π/4, 5π/4

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