Question

यदि sin7x = Cos 11x
हो, तो tan 9x + cot 9x का
मान क्या होगा?​

Answer 1

Answer:

sin 7x = cos 11x

= sin (90° – 11x)

⇒ 7x = 90° – 11x

⇒ 18x = 90°

⇒ x = 5°

∴ tan 9x + cot 9x

= tan45° + cot45°

= 1 + 1 = 2