Wiki can help: Trigonometric functions - Wikipedia, the free encyclopedia

Because I cant. What level is this around?

And what the hell is up with all this trigonometry crap? It was so easy when you just had sin, cos and tan. Then they add csc and cot which is just about all right. And now they have arcsin, arctan, arccos, arccsc, arcsec, arccot!

Whats the point?

Is it just for simplification or something?