Find the domain of definition, period and monotone interval of function y = 2tan (π - 6 - X - 3) | Math enthusiast | Mathematical art

Find the domain of definition, period and monotone interval of function y = 2tan (π - 6 - X - 3)

Function y = 2tan (π - 6 - X - 3)
=-2tan(x\3-π\6)
Domain of definition, x-3 - π - 6 ≠ K π + π / 2
x≠3kπ+2π k∈Z
The domain {x | x ≠ 3K π + 2 π} K ∈ Z
Monotone decreasing interval is
（3kπ-π,3kπ+2π） k∈Z

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