C# and Java are similar in the sense that all programming languages have the same core principles. The skills you gain by reading books on C# and watching Java tutorials are transferable. Both will help you learn to code and start a job in IT.
However, for a beginner, it is usually better to stick to one language at first. That way you can concentrate on understanding its semantics, specifics, and concepts.

Hello,
You can use the following code to calculate sin(180):
double angle = 180;
double sin180 = Math.sin(Math.toRadians(angle));
System.out.println(Math.round(sin180));

Notice we use Math.round() at the end. Otherwise, you will get a number very close to 0, but not exactly zero.
We hope that was helpful. We’re available for any questions to follow.
Have a great day!

Hello,
Yes, we advise you to take your time and don’t rush the material.
Take notes and try to understand the whole video material.
If you have any trouble, you can always ask! We will be happy to answer all your questions.