Ответы на вопрос:
1) 9+(-1 1/2) = 9 - 1 1/2 = 7 1/2
2) 8+(-2 5/7) = 8 - 2 5/7 = 5 2/7
3)5+(-6 2/3) = 5 - 6 2/3 = -1 2/3
А). sin(π/4+3π)=sin(π/4+π+2π)=-sinπ/4=-√2/2 б). cos(p/3-8p)=cosπ/3=1/2 в). sin(9*5/6*p)=sin(7π+π/2 )=-sinπ/2=-1
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