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21.12.2020 •
Mathematics
In ADEF, sin D = 24/26. What is cos E?
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Ответ:
y = 10
Step-by-step explanation:
22y + 100 = 25y + 70
-22y - 22y
100 = 3y + 70
-70 - 70
30 = 3y
y = 30 ÷ 3
y = 10