A সূক্ষ্মকোণ এবং SinA =12/13 হয় ,তবে Cot A এর মান কত?

A 7/12

B 5/13

C 9/13

D 5/12

Solution

Correct Answer: Option D

এখানে ,
SinA =12/13
অতএব ,ভূমি=√(অতিভুজ) ²-(লম্ব )²
                    =√13²-12²
                    =√ 169-144
                    =√25
                     =5
CotA =ভূমি /লম্ব =5/12

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