а) Решите уравнение:
[tex] \dfrac{\sqrt{sin\ x+0,5}\cdot(0,5\cdot log_{\sqrt{7}}sin\ x\ +3\cdot log_{343}cos\ x+\dfrac{log_52}{log_57}) }{cos^26x-1}=0 [/tex]
б) Укажите все корни этого уравнения из промежутка [tex] (\ lg(cos\ 2\pi);\ e^{2ln\sqrt{2\pi}}\ ] [/tex]
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