(14ау-7ву)+(2ах-вх)=7у(2а-в)+х(2а-в)=(7у+х)(2а-в)
1)
производная f^3(2) = 27 => 3f^2(2) * f'(2) = 27 => f'(2) = 9/f^2(2)
производная 1/f(2) = -1 => -1/f^2(2) * f'(2) = -1 => f'(2) = f^2(2)
Тогда f'(2) = 9/f'(2)
(f'(2))^2 = 9
f'(2) = ±3
Ответ:
(11/14+23/42)/(15/16-7/24)+29/31= 3
1)(2sin41+cos(90-41))/2sin30cos49=(2sin41+sin41):2*1/2sin41=3sin41/sin41=3
2)2sin²22,5=1-cos45=1-√2/2
cos2x=1-2sin²x⇒2sin²x=1-cos2x
x=22,5⇒2x=45
3)2√3tg(360-60)-sin(6π-π/4)=2√3*(-tg60)+sinπ/4=-2√3*1/√3+√2/2=-2+√2/2