bNicholson23
31.05.2021 •
Mathematics
Find all solutions to the equation cosx cos(3x) + sin x sin(3x) = 0 on the interval [0, 2π].
![Find all solutions to the equation cosx cos(3x) + sin x sin(3x) = 0 on the interval [0, 2π].](/tpl/images/2385/4821/83f67.jpg)
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Ответ:
153 coins will be there.
Step-by-step explanation:
The number of coin in the bottom row / or last row = 17
The number of coins in the second last row = 16
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The number of coins in the second row = 2
The number of coins in the first row = 1
So the total number of coins = (Number of coin in the first row) + (Number of coins in the second row) + (Number of coins in the third row) + ....... + (Number of coins in the last row / seventeenth row)
Total number of coins = 1+2+3+....+16+17
Total number of coins =
(NOTE: Sum of first n natural number =
)