1) Найти производную y = 1/ arccos^2x

arccos(x)`=-1/(√(1-x²)arccos²(x)`=-2*arccos(x)/√(1-x²)1/arccos²(x)=(1`*arccos²(x)-1*arccos²(x)`)/arccos⁴(x)==(0-(-2*arccos(x)/√(1-x²))/arccos⁴(x)=2*arccos(x)/(arccos⁴(x)*√(1-x²)).