Use the product-to-sum formulas to rewrite the expression as the sum or difference of two functions.cos 
? sin 
?
A. 
cos 
? + 
cos 
?
B. 
cos 
? - 
cos 
?
C. 
sin 
? + 
sin 
?
D. 
sin 
? - 
sin 
?
Answer: D
Mathematics
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B. 3
C. 3
D. 2
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Find the coordinates of the vertex and the direction of opening of each parabola.y = -(x + 7)2 - 9
A. (7, 9) opens downward B. (-7, 9) opens upward C. (-7, -9) opens downward D. (7, -9) opens upward
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Divide, if possible.
A. -16
B. 6
C. - 
D. -6
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