Q1. Prove that the 3 internal angle bisectors of a triangle are concurrent.
Q2.Prove that 2 external bisectors and 1 internal bisector of a triangle are concurrent.
Q3.Prove that 3 altitudes of a triangle are concurrent.
Q4.Find the domain of the function f(x)=1/(√x^12-x^9+x^4-x+1).
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