Verify an identify using the difference formula of two angles

What is the primary goal when proving a trigonometric identity?

• To find the value of an angle

• To equate the left side to the right side

• To memorize all trigonometric formulas

• To solve for x

Which side is generally more logical to start with when proving an identity?

• The right side

• The side with fewer terms

• The side with more terms

• The left side

What is the formula used for the subtraction of two angles in trigonometry?

• sine of U times cosine of V plus cosine of U times sine of V

• cosine of U times cosine of V plus sine of U times sine of V

• sine of U times sine of V minus cosine of U times cosine of V

• sine of U times cosine of V minus cosine of U times sine of V

What is the sine of π according to the unit circle?

• 0

• -1

• Undefined

• 1

How does a negative times a negative affect the result in trigonometric calculations?

• It becomes zero

• It becomes negative

• It becomes positive

• It remains unchanged