An equation is called an identity if it is valid for ___________ values of the variable. The equation is an algebraic identity, and the equation ________________ is a trigonometric identity.
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Verify that the following equation is an identity.
Expand expression on the left-side, but do not apply any trigonometric identities.
We can use identities to help us solve trigonometric equations.
1. Using a Pythagorean identity we see that th equation is equivalent to the basic equation whose solutions are x = _________
How can you tell if an equation is not an identity? Show that the following equations are not identities.
