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$cot90^{\circ}\cdot tan0^{\circ}\cdot $$sec30^{\circ}\cdot cosec60^{\circ}$ এর মান নির্ণয় কর।

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প্রদত্ত রাশি,

$cot90^{\circ}\cdot\tan0^{\circ}\cdot\sec30^{\circ}\cdot cosec60^{\circ}$

$=0\cdot 0\cdot \frac{2}{\sqrt3} \cdot \frac{2}{\sqrt3}$

$=0$
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শূন্য এর সাথে যাই গুণ করা হোক, তা শূন্যই হয়।

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