СРОЧНО!!!ДО ЗАВТРА!!!Помогите,пожалуйста,решить!
1. Вычислите
а) arc cos [tex](- \frac{ \sqrt{2} }{2} )[/tex] -- 2arc sin [tex](- \frac{ \sqrt{2} }{2} [/tex]
б) ctg (arc cos [tex](- \frac{1}{2} [/tex] )
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