1/6х=2
х=2:1/6
х=12
ответ:12
S(t)=F(v)=4t-4√t-1=S(5)-S(2)=20-4*2-8+4=20-8-8+4=8
Х³+х²-х-1=(х³-х)+(х²-1)=х(х²-1)+(х-1)(х+1)=х(х-1)(х+1)+(х-1)(х+1)=(х-1)(х+1)(х+1)=(х-1)(х+1)²
16-4а+а³-а⁴=(16-а⁴)-(4а-а³)=(4-а²)(4+а²)-а(4-а²)=(2-а)(2+а)(2-а)(2+а)-а(2-а)(2+а)=(2-а)²(2+а)²-а(2-а)(2+а)
X∈(Pi/6;5pi/6)
..............................
X^4 -17x^2 +36=0
x^2=t
t^2- 17t + 36=0
D = ( -17)^2 - 4*36= 289 - 144= 145
t1,2= ( 17- \|145) /2