Aim: How do we solve trig equations using reciprocal or double angle identities?

1
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
2
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)
3
Suppose we like to solve for
in the interval of
for
We first need to use double angle formula to
rewrite into
Factor cos ?
4
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?)