СРОЧНО!!!! ДАЮ 40 БАЛОВ
Знайдіть міру гострого кута a, якщо :
а)
[tex] sin \: a \: = \frac{1}{2} [/tex]
б)
[tex]cos \: a \: = \: \frac{ \sqrt{3} }{2} [/tex]
в)
[tex]tg \: a \: = \: 1[/tex]
г)
[tex] \cos \: a \: = \: \frac{ \sqrt{2} }{2} [/tex]
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