trigonometric functions

Question

The Coded Message: Part 1

1. 
2. 
3. 
4. 
5. 
6. 

Decoding Key

Answer 1

Every (x, y) equals (cosΘ, sinΘ) at that angle.

For instance, at 30° = π/6 the (x, y) = (A, M). So cos(30°) = A and sin(30°) = M.

If the angle is negative, then go in the opposite direction (counterclockwise).

sec(Θ) = 1/cos(Θ)

So 1/sec(Θ) = 1 ÷ 1/cos(Θ) = 1(cosΘ) = cos(Θ)