Unit Circle(Radians), Double Angle Theorems, Pythagorean Trig Identity

0

(1, 0)

π/6

(√3/2 , 1/2)

π/4

(√2/2, √2/2)

π/3

(1/2, √3/2)

π/2

(0, 1)

2π/3

(-1/2, √3/2)

3π/4

(-√2/2, √2/2)

5π/6

(-√3/2, 1/2)

π

(−1, 0)

7π/6

(-√3/2, -1/2)

5π/4

(-√2/2, -√2/2)

4π/3

(-1/2, -√3/2)

3π/2

(0, -1)

5π/3

(1/2, -√3/2)

7π/4

(√2/2, -√2/2)

11π/6

(√3/2, -1/2)

sin²θ + cos²θ =

1

sec²θ - tan²θ

1

csc²θ-cot²θ

1

sin2θ

2sinθcosθ

cos2θ

cos²θ - sin²θ

2cos²θ - 1

1 - 2sin²θ