# Derivatives of Trig functions

![image](https://user-images.githubusercontent.com/14041622/40227555-69eb9e74-5ac1-11e8-98cf-75d6088b5b4f.png)

## Reminder of Trig identities & Unit circle values

```python
# Reciprocal and quotient identities
tan(θ) = sin(θ) / cos(θ)
csc(θ) = 1/sin(θ)
sec(θ) = 1/cos(θ)
cot(θ) = 1/tan(θ)
```

[Refer to previous note of all trig identities.](https://github.com/solomonxie/solomonxie.github.io/issues/44#issuecomment-377684464)

![unit circle](https://user-images.githubusercontent.com/14041622/38487029-724164d8-3c11-11e8-9913-17a6da068090.png)
