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X 23 решите. 26cos2x-23cosx+5/13sinx-12 0. 26cos2x-23cosx+5/13sinx-12 [- 5п/2;-п]. 26cos^2x-23cosx+5. 5cos^2x-12sinx-12=0.
26cos2x-23cosx+5/13sinx-12 0. 26cos2x-23cosx+5/13sinx-12 [- 5п/2;-п]. 26cos^2x-23cosx+5. 5cos^2x-12sinx-12=0.

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