Ответ:
а) А= 2•(-0,5) - 3•2 = -1 - 6 = -7
б) А= 2•4 - 3•(-3) = 8+9 = 17
3<span>√</span>2*<span>√</span>5*4<span>√</span>10=12<span>√</span>(2*5*10)=12*2*5=120
Y`=9/cos²x-9=0
9/cos²x=9
cos²x=1
(1+cos2x)/2=1
cos2x=1
2x=2πn
x=πn,n∈z
x=0∈[-π/4;0]
y(-π\4)=9*(-1)-9*(-π/4)+7=-2+9π/4≈5
y(0)=9*0-9*0+7=7 наиб