MBSTU-C_11-12

মান নির্ণয় কর: cotπ20cot3π20cot5π20cot7π20cot9π20\cot \frac{\pi}{20} \cot \frac{3 \pi}{20} \cot \frac{5 \pi}{20} \cot \frac{7 \pi}{20} \cot \frac{9 \pi}{20}

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