The value of `cot36^(@)cot72^(@),` is

The value of cot 36^(@)cot 72^(@) is-

The value of cot^(2)36^(@)cot^(2)72^(@) is

The value of cot18^(@)(cot72^(@)cos^(2)22^(@)+(1)/(tan72^(@)sec^(2)68^(@))) is

The value of cot5^(@)*cot15^(@)* cot 25^(@)* cot 35^(@)* cot45^(@) * cot 55^(@) * cot65^(@) * cot 75^(@) * cot 85^(@) is ________

The value of cot5^(@)cot10^(@) …………. cot85^(@) is …………

The numerical value of cot 18^(@) (cot 72^(@) cos^(2) 22^(@) + (1)/(tan 72^(@) sec^(2) 68^(@))) is

The value of cot41^(@).cot42^(@).cot43^(@).cot44^(@).cot45^(@).cot46^(@).cot.47^(@).cot48^(@).cot49^(@)

The value of cot 5^(@).cot 10^(@).cot 15^(@)……cot 85^(@) is