Задайте, пожалуста, спеиальные вопросы к выделенным словам))

Из треугольника ABD, имеем (BD)^2=(AB)^2-(AD)^2=400-144=256 BD=16   AD=sqrt(BD*DC) => DC=(AD)^2/BD=144/16=9   BC=BD+DC=16+9=25   (AC)^2=(BC)^2-(AB)^2=625-400=225 AC=15   cos(C)=DC/AD=9/12=0,75

1) Who often complains of pain? 2) What have I already read? 3) Where live all students during their course? 4) Whom gave he a good piece of advice? 5) What are provided in our hospital? 6) Who met at the University two years ago? 7) How many times it must be done? 8) By whom were these patients examined? 9) What have you to explain? 10) What can you observe with the help of an ordinary microscope?