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<span>10x-8xy-3xy = 10x - 11xy</span>
Решение
<span>sin3x - sinx = 0
</span>2sin(3x - x)/2 * cos(3x + x)/2 = 0
sinx * cos2x = 0
1) sinx = 0
x = πk, k∈Z
2) cos2x = 0
2x = π/2 + πn, n∈z
x = π/4 + πn/2, n∈Z
(5a-11b)(5a+11b) - 25a²=25a² - 121b² - 25a²= - 121b²
при b=0,01
- 121*0,01²= - 121 * 0,0001= - 0,0121