Let’s see some tips to help us solve trig equations . . .

- If there is more than one trig function, rewrite the equation in terms of only one trig function. This will require using trig identities and, or algebraic manipulation.
- Use factoring if you see an expression in quadratic form.
- Memorize the unit circle
- Solving trig equations is all about trial and error. If you get it wrong the first time, try solving it a different way.

Solving trig equations aren’t very bad. Let’s see how to solve one step by step.

Here’s an example (click here):

1. We can see that the trigonometric expression is written in quadratic form. Let’s move everything to one side of the equation.

2. To make the expression look nicer, we will let .

3. Now, we see much easier how to factor the function. So we will solve for u.

4. We’ll substitute back sin(x)

5. Now we have to check the constraints

, so this has no solutions

6. Put all the solutions together

Here’s another example (click here):

Last example (click here):

Hopefully, that wasn’t too complicated. It may seem difficult at first because everything is a lot easier with a straight through procedure. However, the more you practice, the quicker the answers will come to you. Don’t forget to respect the constraints! Make sure that you double check that your answer is valid in the constraints. Give solving trig equations a few tries and you should be good to go.

Until next time,

Leah

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