1
y`=0-3=-3
2
a)y`=-3sinx+4
y`(0)=-3sin0+4=4
b)y`=(2x²+6x-4x²-6x+10x+15)/(x²+3x)²=(-2x²+10x+15)/(x²+3x)²
3
v(t)=s`(t)=1/2*t
1/2*t=4
t=8
4
f(π/2)=2cosπ/2-3=2*0-3=-3
f`(x)=-2sinx
f`(π/2)=-2sinπ/2=-2*1=-2
Y=-3-2(x-π/2)=-2x-3+π
5
f`(x)=11-6x
11-6x=-1
6x=12
x=2