Question

(viii) Sec4A = Cosec (7A-20°) =হলে tan3A-এর মান নির্ণয় করাে।​

Answer 1

Answer:

given: sec 4A = cosec (7A - 20°)

to evaluate tan 3A

Step-by-step explanation:

sec 4A = cosec (90° - 4A)

=> cosec (90° - 4A) = cosec (7A - 20°)

=> 90° - 4A = 7A - 20°

=> 90° + 20° = 7A + 4A

=> 110° = 11A

=> A = 110 / 11 => 10°

therefore tan 3A = tan 3*10°

=> tan 30° => 1/√3 Answer