(х+2)^2+(x-2)^3=(x^2+4)+(x^3-8)=x^5+12
<span>за формулою
</span>S4=4*(1-2^4)/1-2=60
Решение
a) 8sin(π/6) * cos(2π/3) * tg(4π/3) * ctg(7π/4) = 8*(1/2)*(-1/2)*(√3)*(-1) = 2√3
б) 10*ctg(3π/4) * sin(5π/4) * cos(7π/4) = 10*(-1)*(-√2/2)*(√2/2) = 10*(1/2) = 5
25x -1/x=0
25x²-1=0 x≠0
25x²=1
x²=1/25
x=1/5 x=-1/5
<span>ctg </span>α<span>=√3 і </span>π<span> <</span>α<span>< 3</span>π/<span>2;
1+ctg</span>²α=1/sin²α;
sin α= - 1/√(1+ctg²α)=-1/√(1+(√3)²)=-1/√(1+3)=-1/√4=-1/2.