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. 
Mathematics
Divide, if possible. If a quotient is undefined, state so.68 ÷ (-68)
A. 
B. 1
C. -1
D. 0
Mathematics
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