Автор - Yur4Gau

Найдите область определения функции
y =  frac{1}{2sinx - 1}  +  sqrt{6x - x {}^{2} }

Ответ

Автор - nikebod313

y = dfrac{1}{2sin x-1} + sqrt{6x-x^{2}}

Область определения:

left { {bigg{2sin x - 1 neq 0 } atop bigg{6x-x^{2}geq 0    }} right.             left { {bigg{sin x neq dfrac{1}{2}      } atop bigg{x(6-x) = 0}} right. \\left { {bigg{xneq (-1)^{n} cdot dfrac{pi}{6} + pi n,  nin Z } atop bigg{left[begin{array}{ccc}x = 0\x = 6end{array}right } bigg{Rightarrow x in [0;  6]        } } right.

Пусть n = 0, тогда: xneq (-1)^{0} cdot dfrac{pi}{6} + pi cdot 0 neq dfrac{pi}{6}

Пусть n = 1, тогда: xneq (-1)^{1} cdot dfrac{pi}{6} + pi cdot 1 neq dfrac{5pi}{6}

Пусть n = 2, тогда: xneq (-1)^{2} cdot dfrac{pi}{6} + pi cdot 2 neq dfrac{13pi}{6}

Ответ: x in [0;  6]  /  dfrac{pi}{6};  dfrac{5pi}{6}

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