Lowest value that can get the sin and the cos

[Hepic]

lowest value that can get the "sin" and the "cos"

Sorry for my stupid question,but I forgot them.
What is the biggest and the lowest value that can get the "sin" and the "cos"

Thanks!

 

[Borek]

Sorry, but you should check wikipedia before posting such questions, they just show you are lazy.

 

[arildno]

1.If you think of right-angled triangles, how are "cos(x)" and "sin(x)" defined in terms of the sides?
2. How can you rewrite the Pythagorean theorem in terms of a cos and sin identity?
3. What would this imply that the maxima/minima of cos and sin ought to be?