public static bool TrigIdentitySinPlusCosRunnable(RPN.Node node)
{
return(node.IsAddition() &&
node[0].IsExponent() &&
node[1].IsExponent() &&
node[0, 0].IsNumber(2) &&
node[1, 0].IsNumber(2) &&
(node[0, 1].IsFunction("cos") || node[0, 1].IsFunction("sin")) &&
(node[1, 1].IsFunction("sin") || node[1, 1].IsFunction("cos")) &&
!node.ChildrenAreIdentical() &&
!node.ContainsDomainViolation() &&
node[0, 1, 0].Matches(node[1, 1, 0]));
}
public static bool multiplicationByZeroRunnable(RPN.Node node)
{
return((node[1].IsNumber(0) || node[0].IsNumber(0)) && !node.ContainsDomainViolation());
}
public static bool SameFunctionRunnable(RPN.Node node)
{
return(node.ChildrenAreIdentical() && !node.ContainsDomainViolation());
}