A(t)=cos(t/2)
v(t)=∫cos(t/2)dt+C=2sin(t/2)+C
v(<span>2π/3)=2sin(</span><span>2π/6)+C</span>=√3
2sin(π/3)+C=√3
2*√3/2+C=√3
C=0
v(t)=2sin(t/2)
x(t)=∫2sin(t/2)dt+C=-4cos(t/2)+C
x(2π/3)=-4cos(2π/6)+C=2
-4cos(π/3)+C=2
-4/2+C=2
-2+C=2
C=4
x(t)=-4cos(t/2)+4
<span> (x-4)×(x²+x-2)=0
x12=(-1+-корень(1+8))/2=-2 1
(x-4)(x+2)(x-1)=0
x=4
x=-2
x=1</span>
1. n-(n-(11n-7))
n-(n-11n+7)
n-n+11n-7
11n-7
2. 4m-((7x-3m)+9x)
4m-(7x-3m+9x)
4m-7x+3m-9x
7m-16x
3. 13d-(8d-(13d-(4d+9)))
13d-(8d-(13d-4d-9))
13d-(8d-13d+4d+9)
13d-8d+13d-4d-9
14d-9
4. 3f-(3f-((u-4f)12u)) тут скорее всего опечатка. Возможно два случая:
а) 3f-(3f-((u-4f)+12u))
3f-(3f-(u-4f+12u))
3f-(3f-u+4f-12u)
3f-3f+u-4f+12u
-4f+13u
б) 3f-(3f-((u-4f)-12u))
3f-(3f-(u-4f-12u))
3f-(3f-u+4f+12u)
3f-3f+u-4f-12u
-4f-11u