Подстановка условия
[src]
sqrt(a + 6*sqrt(a - 1*9)) + sqrt(a - 6*sqrt(a - 1*9)) при a = -4
_________________ _________________
/ _______ / _______
\/ a + 6*\/ a - 9 + \/ a - 6*\/ a - 9
$$\sqrt{a - 6 \sqrt{a - 9}} + \sqrt{a + 6 \sqrt{a - 9}}$$
__________________ __________________
/ ________ / ________
\/ a - 6*\/ -9 + a + \/ a + 6*\/ -9 + a
$$\sqrt{a - 6 \sqrt{a - 9}} + \sqrt{a + 6 \sqrt{a - 9}}$$
$$a = -4$$
________________________ ________________________
/ ___________ / ___________
\/ (-4) - 6*\/ -9 + (-4) + \/ (-4) + 6*\/ -9 + (-4)
$$\sqrt{(-4) - 6 \sqrt{(-4) - 9}} + \sqrt{(-4) + 6 \sqrt{(-4) - 9}}$$
___________________ ___________________
/ ________ / ________
\/ -4 - 6*\/ -9 - 4 + \/ -4 + 6*\/ -9 - 4
$$\sqrt{-4 - 6 \sqrt{-9 - 4}} + \sqrt{-4 + 6 \sqrt{-9 - 4}}$$
_________________ _________________
/ ____ / ____
\/ -4 - 6*I*\/ 13 + \/ -4 + 6*I*\/ 13
$$\sqrt{-4 - 6 \sqrt{13} i} + \sqrt{-4 + 6 \sqrt{13} i}$$
sqrt(-4 - 6*i*sqrt(13)) + sqrt(-4 + 6*i*sqrt(13))