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How to find the periodicity and parity of mathematical functions?
Periodicity: Write the function f(x) directly as f(x+T), and find the minimum t value according to the specific situation.

Parity: directly examine whether f(X)=f(-x) and f(x)=-f(-x) are true. The former is even and the latter is odd. However, it must be noted that the function domain must be symmetrical about y, otherwise it is neither odd nor even.