using System;

public class Program

{

    public static void Main()

    {

        double usernumber;

        double usernumber2;

        string userinput2;

        double trig = 180/(Math.PI);

        Console.WriteLine("Do you want to find an angle or the sine/cosine/tangent of an angle");

        string userinput = Console.ReadLine();

        if (userinput == "angle")

        {

            Console.WriteLine("Do you have the sine/cosine/tangent of the angle?");

            userinput2 = Console.ReadLine();

            if (userinput2 == "sine")

            {

                Console.WriteLine("What is the sine?");

                usernumber = Convert.ToDouble(Console.ReadLine());

                Console.WriteLine("The sine of " + usernumber + " is " + (Math.Asin(usernumber))*trig);

            }

            else //cosine

            {

                if (userinput2 == "cosine")

                {

                    Console.WriteLine("What is the cosine?");

                    usernumber = Convert.ToDouble(Console.ReadLine());

                    Console.WriteLine("The cosine of " + usernumber + " is " + (Math.Acos(usernumber))*trig);

                }

                else //tangent

                {

                    Console.WriteLine("What is the tangent?");

                    usernumber = Convert.ToDouble(Console.ReadLine());

                    Console.WriteLine("The tangent of " + usernumber + " is " + (Math.Atan(usernumber))*trig);

                }

            }

        }

        else //sine/cosine/tangent of an angle

        {

            if (userinput == "sine") //sine of an angle

            {

                Console.WriteLine("What is the angle?");

                usernumber = Convert.ToDouble(Console.ReadLine());

                usernumber2 = usernumber/trig;

                Console.WriteLine("The sine of " + usernumber + " is " + (Math.Sin(usernumber2)));

            }

            else 

            {

                if (userinput == "cosine") //cosine of an angle

                {

                    Console.WriteLine("What is the angle?");

                    usernumber = Convert.ToDouble(Console.ReadLine());

                    usernumber2 = usernumber/trig;

                    Console.WriteLine("The cosine of " + usernumber + " is " + (Math.Cos(usernumber2)));

                }

                else //tangent of an angle

                {

                    Console.WriteLine("What is the angle?");

                    usernumber = Convert.ToDouble(Console.ReadLine());

                    usernumber2 = usernumber/trig;

                    Console.WriteLine("The tangent of " + usernumber + " is " + (Math.Tan(usernumber2)));

                }

            }

        }

    }

}