Given the function f (x) = TaNx, X belongs to 0 to 90 degrees, if X1 and X2 belong to 0 to 90 degrees, and x1 ≠ X2, the proof is: 1 / 2 {f (x1) + F (x2)} > F {(x1 + x2) / 2}

Given the function f (x) = TaNx, X belongs to 0 to 90 degrees, if X1 and X2 belong to 0 to 90 degrees, and x1 ≠ X2, the proof is: 1 / 2 {f (x1) + F (x2)} > F {(x1 + x2) / 2}

The function f (x) = TaNx is concave when x belongs to 0 to 90 degrees
This is because the derivative of TaNx = (secx) ^ 2
The second derivative of TaNx = 2tanx (secx) ^ 2 > 0
According to the definition of concave function
It should be {f (x1) + F (x2)} / 2 > F {(x1 + x2) / 2}
The proof is complete