mariss8152
02.11.2020 •
Mathematics
A 40-ounce solution is 50% alcohol. How many ounces of water would have to be added to the solution to create a solution that is 20% alcohol?
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Ответ:
am not sure but i think 16
Step-by-step explanation:
Ответ:
2sin(arctan(3/4))cos(arctan(3/4))
Let z = arctan(3/4) => tan(z) = 3/4
2sin(arctan(3/4))cos(arctan(3/4)) = 2sin(z)cos(z) = 2(3/5)(4/5) = 24/25
cos(2t) = cos^2(t) - sin^2(t) = cos^2(z) - sin^2(z) = (4/5)^2 - (3/5)^2 = (16 - 9)/25
= 7/25
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