[Solved] how can I calculate exponential fraction [duplicate]

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As you mentioned C++ in the tag, try one of this method: 

double pow (double base     , double exponent);
float pow (float base      , float exponent);
long double pow (long double base, long double exponent);
double pow (Type1 base      , Type2 exponent); // additional overloads

Returns base raised to the power exponent.

See reference here.

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solved how can I calculate exponential fraction [duplicate]