High School Math : Using Sum and Product Identities

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #3 : Trigonometric Identities

Simplify .

Possible Answers:

Correct answer:

Explanation:

To simplify , break them into their SOHCAHTOA parts:

.

Notice that the opposite's cancel out, leaving .

Example Question #11 : Trigonometric Identities

Simplify .

Possible Answers:

This is the most simplified version.

Correct answer:

Explanation:

Break down  into SOHCAHTOA to solve:

 and .

Therefore, . Note that the opposite's cancel out, leaving , which is the same as .

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