" 18) "tan A+2tan2A+4tan4A+8cot8A=cot A

Prove that tan A+2tan2A+4tan4A+8cot8A=cot A

Prove that : tan A + 2tan2A + 4 tan4A + 8cot8A =cotA

tan A+2tan2A+4tan4A+8cot8A=k cot A then find the value of k.

Prove the following: tanA+2tan2A+4tan4A+8cot8A=cotA

evaluate tan A+2tan2A+4tan4A+8cot8A=?

(1)/(tan 3 A - tan A)- (1)/(cot 3 A - cot A)= .............. A) tan A B) tan 2A C) cot A D) cot 2A

(sec 8 A-1)/( sec 4A-1)= ..................... A) (tan 2A)/( tan 8A) B) (tan 8A)/(tan 2A) C) (cot 8A)/(cot 2A) D) (tan 6A)/(tan 2A)

(sec8A-1)/(sec4A-1) is equal to (A) (tan2A)/(tan8A) (B) (tan8A)/(tan2A) (C) (cot8A)/(cot2A) (D) none of these

(sec8A-1)/(sec4A-1) is equal to (A) (tan2A)/(tan8A) (B) (tan8A)/(tan2A) (C) (cot8A)/(cot2A) (D) none of these