1.) 1.2132117058
2.) 3.9171644
3.) 1.906130684
4.) 41.12519869
5.) 8.94427191
X ^ 2 + 5x <-4
x ^ 2 + 5x + 4 <0
(x + 1) (x + 4) <0
x = -1
x = -4
(- 4, -1)
I'm guessing that you don't really want the formulas. I think what you actually want
is the definitions of those functions of an acute angle when it's in a right triangle.
Cosine = (adjacent side) / (hypotenuse)
Tangent = (opposite side) / (adjacent side)
Sine = (opposite side) / (hypotenuse)
Tell me if I'm wrong, and I'll find some formulas for you.