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You are not using it correctly. To calculate the exponential of a number you use the key sequence [SHIFT][LN] to access the exponential function. Then type it the exponent (positive or negative) and close the parenthesis. You do not use the power key (^) The exponential function is not affected by the angle unit when you are using real values.
If you are using an HP 12c or have the button on the calculator "yx" you first enter the number you wish to raise (y) then enter then the power (x). For instance to find 230 (2 to the power of 30) you input the number 2 then hit the enter key on the calculator, then input 30 and hit the yx button.
If you have another model of calculator the procedure may be similar or the buttons. Play around with it. By the way the solution to 2 raised to the 30th power is 1,073,741,824.
You have two buttons to calculate powers: The [x^2] calculates the square of a number while the [caret ^] key allows you to calculate any power, be it with integer, fraction or negative exponent. Both keys are next to one another, one below OPTN and the other below the VARS key. To calculate roots, you have the square root [SHIFT][x^2] the xroot key [SHIFT] [caret ^] , the CUBE root [SHIFT] [(] , and the inverse key [SHIFT][).
To raise 10 to a power, use 10^x (the 2nd function of the LOG key). To raise e to a power, use e^x (the 2nd function of the LN key). To raise a number to another, use y^x (the key just above the divide key).