If `A = tan 6^@ tan 42^@ and B = cot 66^@ cot 78^@,` then

If A =tan6^0tan42^0 and B=cot66^0cot78^0 , then

tan 6 ^(@) tan 42 ^(@) tan 66 ^(@) tan 78^(@) =1

cot 6^0 cot 42^0 cot 66^0 cot 78^0=1

Suppose x and y real number such that tan x tan y=42 and cot x +cot =49 the value of tan (x+y) is ____________

Evaluate : tan 25^(@) tan 65 ^(@) - cot 25^(@) cot 65^(@)

Prove that : tan 225^@ cot 405^@+ tan 765^@ cot 675^@=0

tan theta + 2 tan 2 theta + 4 tan 4 theta + 8 cot 8 theta = cot theta.

Let theta in (0,pi/4) and t_1=(tan theta)^(tan theta), t_2=(tan theta)6(cot theta), t_3=(cot theta)^(tan theta) and t_4=(cot theta)^(cot theta), then

If tanA-tan B=x , and cot B-cotA=y , then find the value of cot(A-B) .

Prove that tan A - cot A =-2 cot2A