Формула куб суммы (а+b)^3=a^3+3a^2b+3ab^2+b^3
Y = kx + b
( 8 ; - 1 ) ; ( - 10 ; - 19 )
- 1 = 8k + b
- 19 = - 10k + b
19 = 10k - b
18 = 18k
k = 1
- 1 = 8 + b
b = - 9
Ответ y = x - 9
S = πR² = π·16≈3·16 = 48(м²)
Sinb*cosb+2=1/2*sin2b +2=(sin2b+4)/2
5cos²b+1=5*(1+cos2b)/2 +1=(5+5cos2b+2)/2=(7+5cos2b)/2
(sin2b+4)/2 : (7+5cos2b)/2=(sin2b+4)/2 *2/(7+5cos2b)=(sin2b+4)<span>/(7+5cos2b)</span>