What is the value of tan 400 tan 500tan600?
A
1
B
13
C
 3
D
 -3
Correct Answer:  3
এখানে, tan40° tan50° tan60° = tan(90° - 50°) tan50° tan60° = cot50° tan60° = cot50°.1cot50°tan60° = 1.tan60° = tan60° = 3