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pollyver
@pollyver
July 2022
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25 Баллов!
6sin^2х + 5sin( п\2-х)-2=0
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Answers & Comments
321Roman123
6 - 6cos^2(x) + 5cos(x) - 2 = 0
6cos^2(x) - 5cos(x) - 4 = 0
D = 25 + 96 = 121
[cos(x)]1 = (5 - 11) / 12 = -1/2
[cos(x)]2 = (5 + 11) / 12 > 1 - не удовл. E(cos(x))
x = +-(pi - pi/3) + 2pik = +-2pi/3 + 2pik, k E Z
2 votes
Thanks 1
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Answers & Comments
6cos^2(x) - 5cos(x) - 4 = 0
D = 25 + 96 = 121
[cos(x)]1 = (5 - 11) / 12 = -1/2
[cos(x)]2 = (5 + 11) / 12 > 1 - не удовл. E(cos(x))
x = +-(pi - pi/3) + 2pik = +-2pi/3 + 2pik, k E Z