I have a SHARP EL-501W calculator and i am getting the wrong answers with the tan -1 function Hi, The source of errors is most certainly due to the wrong schoice of angle unit (degree or radian). If ...
then know that each function shares the same physical key as its inverse. For example to access the arcsine (the function inverse of sine) you press the [SHIFT] key before [SIN]. On the calculator you
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