C++

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illegal else without matching if

Laughingman (1)
When Im running my code with the Powershell, it showed that "error C2181 illegal else without matching if"

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  #include "calculate.h"

void calculate( istream& in, ostream& out )
{
        string oper;
        int degrees;
        double radians;
        double answer;
        in >> oper;
        in >> degrees;
        while ( !in.fail() )
        {
            if ( oper == "sin" );
            { 
                 answer=sin(degrees*(180/M_PI));
            }
            else if ( oper == "cos" );
            {
                 answer=cos(degrees*(180/M_PI));
            }
            else if ( oper == "tan" );
            {
                answer=tan(degrees*(180/M_PI));
            }
            in >> oper;
            in >> degrees;
			out << "Operations"<<"\tAngle"<<"\tAnswer"<<endl;
            out << "sin"	<<degrees<< answer<<endl;
            out << "cos"    <<degrees<< answer<<endl;
            out << "tan"    <<degrees<< answer<<endl;			
        }   
}
Danny Toledo (469)
Remove the semicolons from lines 13, 17 and 21.
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