- Convert everything to sine and cosine. In other words, get rid of the tangents, cotangents, cosecants and secants.
- Work with the more complex side first: it's often easier to simplify expressions that are complex than to make the more simple side equal to the more complicated one.
- Use common denominators: if the two sides have different denominators, how can they equal to each other?
- If the sines and cosines have 2 or 4 as their exponents, then try to use the identity
*sin*to simplify.^{2}θ + cos^{2}θ = 1 - Don't just work on one side: unless one of the sides is a simple value like "
*1*" or "*sin θ",*it's usually a good idea to try to make the two sides meet in the middle. - Factor: A lot of times it is important to factor, as this would often help simplifying the sides

## Thursday, October 20, 2011

### Strategies for Proving Trigonometric Identities

From all the trig identity problems that I have solved, I have come up with these strategies:

Labels:
math

Strategies for Proving Trigonometric Identities

2011-10-20T20:49:00-04:00

K

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