Simplify.2

A.
B.
C.
D.


Answer: A

Mathematics

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Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°

A.
B.
C.
D.

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Divide, if possible. If a quotient is undefined, state so.68 ÷ (-68)

A.
B. 1
C. -1
D. 0

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Find A-1 without a calculator.A = 

A. A-1 = 
B. A-1 = 
C. A-1 = 

Mathematics

Divide, if possible. If the quotient is undefined, then state this.

A.  
B. 4 
C. -4 
D. -6

Mathematics