- ?Lv 51 0 年前最佳解答
1. A tangent function has symmetry about the origin (0,0) between the interval of -90 deg and +90 deg.
If you look at the graph of a tan(x) carefully enough, it's not hard to notice the graph stays the same you mirror it to the y-axis and then again to the x-axis. This is called Symmetry About the Origin.
But please keep in mind there is a x-range (interval) restriction because of the infinity issue... tan(90 degree) = oo/0 = +oo infinity...
- Blinka GLv 61 0 年前
For any given tangent function, -f(x) = f(-x), which by definition is an odd function.
-tangent function: http://www.analyzemath.com/Tangent/Tangent.html
-even/odd function: http://en.wikipedia.org/wiki/Even_and_odd_function...
- WJLv 41 0 年前