Given the function f (x) = TaNx, X belongs to (0, Wu / 2), if x1, X2 belong to (0, Wu / 2), X1 is not equal to X2, try to prove: 1 / 2 [f (x1) + F (x2)] > F [(x1 Given the function f (x) = TaNx, X belongs to (0, Wu / 2), if x1, X2 belong to (0, Wu / 2), X1 is not equal to X2, try to prove: 1 / 2 [f (x1) + F (x2)] > F [(X1 + x2) / 2]

Given the function f (x) = TaNx, X belongs to (0, Wu / 2), if x1, X2 belong to (0, Wu / 2), X1 is not equal to X2, try to prove: 1 / 2 [f (x1) + F (x2)] > F [(x1 Given the function f (x) = TaNx, X belongs to (0, Wu / 2), if x1, X2 belong to (0, Wu / 2), X1 is not equal to X2, try to prove: 1 / 2 [f (x1) + F (x2)] > F [(X1 + x2) / 2]

Take X1 and X2 into f (x) = TaNx
Left = 1 / 2 (tanx1 + tanx2)
Right = Tan [(x1 + x2) / 2]
Using sum angle formula (t (α + β))
The left minus the right, compare the size