Use the product-to-sum formulas to rewrite the expression as the sum or difference of two functions.sin 6? sin 4?

A.  cos 10? -  cos 2?
B. sin2 24?2
C.  cos 2? -  cos 10?
D.  sin 10? +  cos 2?

Answer: C

Mathematics

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A. -2x2 + 11x - 15 B. -2x2 + 13x + 13 C. -2x2 - 15x + 13 D. -2x2 + 13x - 15

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The temperature on a certain day as measured at the airport of a city is changing at the rate of

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A. 0, , , 
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