Trigonometry

1. Angle

2. In clockwise angle is negative

3. In anticlockwise angle is positive

4. Measuring angles

5. Degree measure

6. Redian measure

6.1. Relation between redian and degree

6.2. 2π radian = 360°

6.3. 1 degree = 0.01746 radian

6.3.1. Six fundamental trigonometric identities

6.3.2. sinx = 1/cosec(x)

6.3.3. cos x = 1/sec(x)

6.3.4. tan x = 1/cot(x)

6.3.5. sin2 x + cos2 x = 1

6.3.6. 1 + tan2x = sec2 x

6.3.7. 1 + cot2 x = cosec2 x