Решить уравнение
[tex]cosx^2+cos2x^2=cos3x^2[/tex]
Ответ: x=п/4+пn/2
x=+- [tex]1/2arcos \frac{1- \sqrt{17} }{4} + \pi n[/tex]
Номер 69 под цифрой один.
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