SetLocalCancellationToken​(System.​Threading.​CancellationToken)

Entity eq = "a e sin(x ^ 14 + 3)3 + a b c d sin(x ^ 14 + 2)4 - k d sin(x ^ 14 + 3)2 + sin(x ^ 14 + 3) + e = 0";

using var tokenSource = new CancellationTokenSource();
tokenSource.CancelAfter(millisecondsDelay: 1000);
Multithreading.SetLocalCancellationToken(tokenSource.Token);

var task = Task.Run(() => eq.Solve("x"));

try
{
    while (!task.IsCompleted)
    {
        Thread.Sleep(100);
        Console.WriteLine("Not completed yet. Waiting 100 ms...");    
    }
    Console.WriteLine(task.Result);
}
catch (AggregateException e)
{
    if (e.InnerExceptions.AsEnumerable().Any(c => c is OperationCanceledException))
        Console.WriteLine("Operation cancelled");
    else
        throw;
}

Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Not completed yet. Waiting 100 ms...
Operation cancelled