It is known that a > 0, b > 0 and a + B0, b > 0 and a + B = 1 / 2 B, 1 / A + 1 / b > = 1 C, AB > = 2 D, 1 / (a square + b square) under the root sign

It is known that a > 0, b > 0 and a + B0, b > 0 and a + B = 1 / 2 B, 1 / A + 1 / b > = 1 C, AB > = 2 D, 1 / (a square + b square) under the root sign

Choose B
A > 0, b > 0 and a + B are known