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2 answers:
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Answer: see proof below
<u>Step-by-step explanation:</u>
Use the Double Angle Identity: cos 2A = 2cos²A - 1
Use the Difference Identity: cos (A - B) = cosA · cosB + sinA · sinB
Use the Unit Circle to evaluate: cos (π/2) = 0 & sin (π/2) = 1
<u>Proof LHS → RHS</u>
LHS = RHS: sin A = sin A
<h2>How to find the cost per can</h2>
To find the cost per can, we can divide the total cost by the number of cans.
Total cost: $5.55
Number of cans: 12
The cost per can will be:
$0.4625 per can
How about Food Lion?
<h2>Food Lion</h2>Total cost: $2.75
Number of cans: 6
The cost per can will be:
Around $0.4583 per can
<h2>Comparing</h2>BiLo: $0.4625
Food Lion: around $0.4583
As we can see, Food Lion has a better cost per can, as it costs less to buy each can of Pepsi.
Answer: Food Lion has a better cost per can