Find cos(A - B).cos A = -
and cos B =
, where
and
.
A. -
B.
C.
D. -
Answer: D
Mathematics
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A. 9x2 - 3xy - 3y2 B. 9x2 - 18xy - 30y2 C. 9x2 - 3xy - 30y2 D. 9x2 + 15xy - 30y2
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