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

 Previous Pro (1 point) Use a sum or difference formula or

a half angle formula to determine the value of the trigonometric functions.

Previous Pro (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(- 13x 12 sin( 17) 12 COs(- 12 )= cos 12 Note: You can earn partial credit on this

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