Multiply using the rule for finding the product of the sum and difference of two terms.(3 + r)(3 - r)
A. 9 - r2
B. 9 - 6r - r2
C. 6 - r2
D. 9 + 6r - r2
Answer: A
Mathematics
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Find the exact value of the expression.sin 20° cos 100° + cos 20° sin 100°
A. 
B. 
C. - 
D. - 
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Use identities to write each expression as a function of ?.cos 
A. -cos ? B. -sin ? C. cos ? D. sin ?
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Use a vertical shift to graph the function.y = cos x - 2
A. 
B. 
C. 
D. 
Mathematics