Find the minimum value of the function y = 9 / sin ^ 2x + 4sin ^ 2x, multiply a + b > = 2 by the square root of ab Can't we find the minimum value of the function y = 9 / sin ^ 2x + 4sin ^ 2x and multiply a + b > = 2 by the square root of AB? The answer is to change y = 9 / sin ^ 2x + 4sin ^ 2x to 4 / sin ^ 2x + 4sin ^ 2x + 5 / sin ^ 2x Using the above formula, is it unnecessary to do so? And there is a difference between the two results? Which brother would you like to answer in detail Note: sin ^ 2x is the square of (SiNx)

Find the minimum value of the function y = 9 / sin ^ 2x + 4sin ^ 2x, multiply a + b > = 2 by the square root of ab Can't we find the minimum value of the function y = 9 / sin ^ 2x + 4sin ^ 2x and multiply a + b > = 2 by the square root of AB? The answer is to change y = 9 / sin ^ 2x + 4sin ^ 2x to 4 / sin ^ 2x + 4sin ^ 2x + 5 / sin ^ 2x Using the above formula, is it unnecessary to do so? And there is a difference between the two results? Which brother would you like to answer in detail Note: sin ^ 2x is the square of (SiNx)

The value range of sin ^ 2x is [0,1], but the equation + b > = 2 times the square root of AB can get the equal sign
Sin ^ 2x = 3 / 2 or - 3 / 2, so you can't