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

If A=tan6^(@) tan 42^(@) and B= cot 66^(@)cot 78^(@) then-

If A=tan6^(@)tan42^(@) and B=cot66^(@)cot78^(@), then

If A=tan6^(@)tan42^(@) and B=cot66^(@)cot78^(@) then

If A = tan11^(@)tan29^(@),B=2cot61^(@)cot79^(@) , then:

The value of tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@) is

If tan x+tan y=25 and cot x+cot y=30

If tan A - tan B =x and cot B - cot A=y, then: cot(A-B)=

Without using trigonometric tables, prove that : (i) tan 48^@tan 23^@tan 42^@tan 67^@ =1 (ii) tan 7^@tan 23^@ tan 60^@ 67^@tan 83^@=sqrt(3) (iii) cot 12^@cot 38^@cot 52^@cot 60^@cot 78^@=(1)/(sqrt(3))