Cot-20-cot3-20-cot5-20-cot7-20-cot9-20 -

The correct option is A 1 π20.3π20.5π20.7π20.9π20.θ=tanπ2 θ =tanπ2 π20.tanπ2 3π10.5π20.7π20.9π20 =tan9π20.tan7π20.5π20.7π20.9π20 =19π20.17π20 ...

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Trigonometric Ratios for Sum of Two Angles

cotπ20.cot3π2...

Question

$c o t \frac{π}{20} . c o t \frac{3 π}{20} . c o t \frac{5 π}{20} . c o t \frac{7 π}{20} . c o t \frac{9 π}{20} =$

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