Perform the indicated operations.(2x9 + 8x7 - 8x3 + 9) - (8x9 - 3x5 + 9x3 - 12)
A. 6x9 + 8x7 - 3x5 - 17x3 + 21
B. -6x9 + 8x7 + 3x5 - 17x3 + 21
C. -6x9 + 8x7 - 3x5 - 17x3 + 21
D. 6x9 + 8x7 + 3x5 - 17x3 + 21
Answer: B
Mathematics
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A. 7
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Find cos(A - B).cos A = - 
and cos B = - 
, with A and B in quadrant III.
A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 
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