An easy to use calculator to compute logarithms and exponential to any base.
How to use the calculator
1  logarithm : Enter x and the base b, such that x greater than 0 and b greater than 0 and not equal to 1; then press press "enter_log".
2  exponential : Enter x and the base b, such that b greater than 0; then press press "enter_exp".
If any of the conditions above are not met, the answer is "not real".
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