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Project ID:
1003086107
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1
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Množina řešení rovnice \( 2\mathrm{tg}^2x + 4\cos^2x = 7 \) pro \( x\in\mathbb{R} \) je:
\( \bigcup\limits_{k\in\mathbb{Z}}\left\{\frac{\pi}3+k\pi;\frac{2\pi}3+k\pi\right\} \)
\( \bigcup\limits_{k\in\mathbb{Z}}\left\{\frac{\pi}3+2k\pi;\frac{2\pi}3+2k\pi\right\} \)
\( \bigcup\limits_{k\in\mathbb{Z}}\left\{\frac{\pi}3+k\pi\right\} \)
\( \bigcup\limits_{k\in\mathbb{Z}}\left\{\frac{2\pi}3+k\pi\right\} \)