what is sin

Sin is getting too much of a Tan, Cos you forgot to use sunscreen......

sin is a transgression.

sin^-1 is a good deed.

M^-1

Sin has many definitions. However, this website is a mathematics based site so, I will talk about the mathematical definition.

Sin is a mathematical function of Sine. Usually used like this:

sin(θ) = $$\frac{Opposite}{Hypotenuse}$$

CPhill... You made my day XD

Thanks, TM....!!!.......I always like to provide  a little humor when I can......

BTW.....I gave everyone 3 pts on this one.......

Yes there are some good answers here!  Thanks guys.