Michael J. answered 09/11/16
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Effective High School STEM Tutor & CUNY Math Peer Leader
y = 1 / sinx
Set sinx equal to zero.
sinx = 0
x = sin-1(0)
x = 0
x = π
x = 2n
From this pattern the vertical asymptotes occur at
x = πn
where n is any integer from negative infinity to positive infinity, including zero.