The expression `cot 9^@ + cot 27^@ + cot 63^@ + cot 81^@` is equal to

The expression cot9^(@)+cot27^(@)+cot63^(@)+cot81^(@) is equal to

The expression (tan 57^@ + cot37^@)/(tan 33^@ + cot 53^@) is equal to

cot 15^@ + cot 75^@ + cot 135^@ - cosec 30^@ equals

The simplest value of cot90^@ cot 27^@ cot 3^@ cot 81^@ is

The value of cot9^@cot27^@cot63^@cot81^@ is :

What is cot 1^(@) cot 23^(@) cot 45^(@) cot 67^(@) cot 89^(@) equal to ?

Let a, b, c , d he real numbers such that a + b+c+d = 10 , then the minimum value of a^2 cot 9^@+b^2 cot 27^@+c^2 cot 63^@+d^2 cot 81^@ is sqrtn ,(n in N) find n.

What is cot 15 ^(@)cot 20^(@) cot 70^(@) cot 75 ^(@) equal to ?

Value of ( 3 + cot 80^(@) cot 20^(@))/(cot 80^(@) cot 20 ^(@)) is equal to