Trigonometric Functions

1. tan(x)=sin(x)/cos(x)

1.1. sin(x)/cos(x)

2. cot(x)=1/tan(x)

3. sec^2(x)=tan^2(x)+1

4. cos^2(x)+sin^2(x)=1

5. sin(2x)=2sin(x)cos(x)

6. csc(x)=1/sin(x)

7. csc^2(x)=1+cot^2(x)

8. cos(2x)=1-sin^2(x)

9. sec(x)=1/cos(x)

10. cos(2x)=2cos^2(x)-1