Ответы на вопрос:
A) 11/27 + 4/9 = 11/27 + 12/27= 21/27= 7/9 б) 8/11 + 5/44 = 32/44 + 5/44 = 37/44 в) 11/25 + 2/5 = 11/25+ 10/25 = 21/25 г) 1/6 + 13/36 = 6/36 + 13/36 = 19/36
2cos² x-1=sin x2(1-sin² x)-1-sin x=0 2sin² x+sin x-1=0 sin x=-1, x=-п/2+пk, k: z sin x=1/2, x=(-1)^m*п/6+пm, m: z
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