Question: 9. (1 point) Use a sum or difference formula or a half angle formula to determine the value of the trigonometric functions. Give exact answers.

9. (1 point) Use a sum or difference formula or a

9. (1 point) Use a sum or difference formula or a half angle formula to determine the value of the trigonometric functions. Give exact answers. Do not use decimal numbers. The answer should be a fraction or an arithmetic expression. If the answer involves a square root it should be enter as sqrt; e.g. the square root of 2 should be written as sqrt(2); sin(- sin( COS COS Correct Answers

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