Ответ:
Объяснение:
\[cos \alpha = cos^{2} \frac{\alpha}{2} - sin^{2}\frac{\alpha}{2}\]
\[cos^{2}15 - sin ^{2}15 = cos 30\]
\[cos 30^{0} = cos \frac{\pi}{6} = \frac{\sqrt{3}}{2}\]
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Ответ:
Объяснение:
\[cos \alpha = cos^{2} \frac{\alpha}{2} - sin^{2}\frac{\alpha}{2}\]
\[cos^{2}15 - sin ^{2}15 = cos 30\]
\[cos 30^{0} = cos \frac{\pi}{6} = \frac{\sqrt{3}}{2}\]