Question

cot 10°. cot 20.cot 60° cot 70° cot 80° का मान क्या होगा ?​

Answer 1

Answer:

Step-by-step explanation:

cot 10°. cot 20.cot 60° cot 70° cot 80°

= tan(90°- 10°). tan(90°- 20°).cot 60° cot 70° cot 80°

= tan 80°. tan 70° .cot 60°. cot 70°. cot 80°

=(tan 80°.cot 80°) (tan 70°. cot 70°). cot 60°

$= 1 \times 1 \times \frac{1}{ \sqrt{3} } \\ = \frac{1}{ \sqrt{3} } \:$