Proving Identities Involving Other Functions These identities involve trigonometric functions as well as other functions that we have studied.
An equation is called an identity if it is valid for values of the variable. The equation2x=x+x is an algebraic identity, and the equation sin2x+cos2x=________ is a trigonometric identity.
If we know the values of the sine and cosine of xand y,we can find the value ofsin(x+y) by using the ___________ Formula for Sine. State the formula:
Simplifying Trigonometric Expressions-
Use an Addition orSubtraction Formula to find the exact value of the expression, asDemonstrated
Proving Identities Involving Other Functions
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