Multiply.(7x - 9y)2
A. 7x2 + 81y2
B. 7x2 - 126xy + 81y2
C. 49x2 + 81y2
D. 49x2 - 126xy + 81y2
Answer: D
Mathematics
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B. 
C. 
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Simplify the expression.
+ tan ?
A. sin2 ? B. 1 C. cos ? + sin ? D. sec ?
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