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If A=tan6^0tan42^0 and B=cot66^0cot78^0 ...

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

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

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^(@) 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^(@), B=cot66^(@) cot78^(@) then

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

Prove that: tan6^0tan42^0tan66^0tan78^0=1.