<span>Sin 865</span>° = Sin(90° * 9 + 55°) = Cos55°
<span> tg 31</span>π/4 = tg(8π - π/4) = -tgπ/4= -1
<span> Sin11</span>π/3 <span>+ cos19</span>π/6=Sin(4π - π/3) + Cos(3π + π/6) =
= - Sinπ/3 - Cosπ/6 = -√3/2 -√3/2 = -√3
<span>упростить корень3-5корень108+1/2корень 12=</span>√3-5√(3*6²)+1/2√(3*2²)=√3-30√3+√3=-28√3
1) (x-9)(x+9)
2) (y-2)^2
3) c^2+12c+36-c^2-12c = 36
13:x=19:9.5
13:x=2
x=13:2
x=6.5
Ответ:x=6.5
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