Expression * diff()
{
Expression * ex = (Expression*)new Mul(e1->diff(), e2);
Expression * ex1 = (Expression*)new Mul(e1, e2->diff());
Expression *ex2 = (Expression*)new Add(ex, ex1);
return ex2;
}
Expression * diff()
{
Expression * ex = (Expression*)new Mul(e1->diff(), e2);
Expression * ex1 = (Expression*)new Mul(e1, e2->diff());
Expression *ex2 = (Expression*)new Sub(ex, ex1);
Expression *ex3 = (Expression*)new Mul(e2, e2);
Expression *ex4 = (Expression*)new Div(ex2, ex3);
return ex4;
}
Expression * Sin::diff()
{
Expression * ex;
if (e1->diff() == 0)
ex = (Expression*)new Number(0);
else
ex = (Expression*)new Cos(e1);
return ex;
}
Expression * diff()
{
Expression * ex = (Expression*)new Sub(e1->diff(), e2->diff());
return ex;
}
