Find the first TWO non-negative asymptotes and the first negative asymptote of the graph of in radians

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smallest non-negative asymptote:

second non-negative asymptote:

first negative asymptote:

okay, i know the first one is pi/5

but the other two i do not know how to find. can some one please help me?

but i keep thinkin the other two answers are x=+-(pi/10). (which is wrong)