2. Aim: How do we solve trig equations using reciprocal or double angle identities? Do Now: 1. Rewrite in terms of 2. Use double angle formula to rewrite HW: p.541 # 4,5,7,8,10,12,14,15

3. Suppose we like to solve for in the interval of for To do this, we just do like proving trig identity, we first rewrite the equation in terms of sine or cosine function. (reject)

4. Suppose we like to solve for in the interval of for We first need to use double angle formula to rewrite into Factor cos θ

5. 1. Solve for x in the interval for 2. Solve for x in the interval for cos 2x + sin x = 1 3. Solve for in the interval for (60 ,300 ,180  )