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rubaaalko16
@rubaaalko16
July 2022
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Решите математику подробно
Пожалуйста 10-11кл
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IrkaShevko
Verified answer
1) log3(7) - (log3(7) - log3(9)) = log3(9) = 2
2) 13cos²a - 15 + 13sin²a = 13 - 15 = -2
3) -9cosx+4 = 4
-9cosx = 0
cosx = 0
x = π/2 + πk, k∈Z
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Answers & Comments
Verified answer
1) log3(7) - (log3(7) - log3(9)) = log3(9) = 22) 13cos²a - 15 + 13sin²a = 13 - 15 = -2
3) -9cosx+4 = 4
-9cosx = 0
cosx = 0
x = π/2 + πk, k∈Z