`(tan 40^@ +tan 20^@)/(cot 45^@ - cot 50^@cot 70^@)=` (A) `sqrt3` (B) 1 (C) 0 (D) `-1`

(tan40^(@)+tan20^(@))/(tan225^(@)-cot50^(@)cot70^(@))=(i)sqrt(3)(ii)(1)/(sqrt(3))(iii)1(iv)0

tan70 ^ (@) - tan20 ^ (@) = k cot40 ^ (@) rArr k =

(1)/(tan 3 A - tan A)- (1)/(cot 3 A - cot A)=

Prove that tan 70^(@)=cot70^(@)+2cot40^(@)

Prove that tan 70^(@)=cot70^(@)+2cot40^(@)

(cot50^(@))/(tan40^(@))

The value of (cot 54^(@))/(tan 36^(@)) + (tan 20^(@))/(cot 70^(@)) is.............. (A) 0 (B) 2 (C) -2 (D) 1

(tan A + tan B)/( cot A + cot B)+(1- tan A tan B)/( 1- cot A cot B)=

Prove that tan 70^(@)=cot70^(@)++2cot40^(@)

Prove that tan 70^(@)=cot70^(@)++2cot40^(@)