Practicing Success
Find the value of cot10° . cot19° . cot28° . cot37° . cot45° . cot53° . cot62°. cot71° . cot80° . |
2 1 -1 0 |
1 |
cot10° . cot19° . cot28° . cot37° . cot45° . cot53° . cot62°. cot71° . cot80° Here, ⇒ (cot A . cot B = 1, when A + B = 90°) So, ⇒ (cot10° . cot80°) . (cot19° . cot71°) . (cot28° . cot62°) . (cot37° . cot53°) . cot45° = 1 × 1 × 1 × 1 × 1 = 1 |