Ответ:
Объяснение:
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sin 54- sin 18 = 2 sin (54-18 /2) *cos (54+18)/2=2 *sin18*cos72=2 sin^2(18)=1-cos36=
3) ab + ac + am + yc + yb + ym =
= (ab + ac + am) + (yc + yb + ym) =
= a(b + c + m) + y(c + b + m) = (a + y)(c + b + m)
4) kp - kc - px + cx + c - p =
= (kp - kc) - (px - cx) - (p - c) =
= k(p - c) - x(p - c) - (p - c) =
= (k - x - 1)(p - c)
13=√(4^2+12^2+z^2);
13^2=16+144+z^2;
z^2=169-150=9;
z=+-3
11 ^ (X-10) = 11
11 ^ ( X - 10) = 11 ^ 1
X - 10 = 1
X = 11
проверка: 11 ^ 1 = 11