`cot1 5^(@)+cot7 5^(@)+cot13 5^(@)-c o s e c3 0^(@)=`

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

The value of (tan55^(@))/(cot35^(@))+cot1^(0)cot2^(0)cot3^(0)...cot90^(@), is -2 (b) 2(c)1(d)0

The value of (1-cot2^(0))(1-cot5^(0))(1-cot11^(0))(1-cot34^(0))(1-cot40^(@))(1-cot43^(0))(1+cot45^(@)) is

2 cot ^(-1) 5+cot ^(-1) 7 + 2 cot ^(-1) 8=(pi)/(4)

What is the value of the expression (Cot 1^@ cot2^@ cot3^@ Cot4^@ co5t^@ _____ Cot 90^@ (A) O (B) 1 (C ) 2 (D) 1/2

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

Prove that 4(cot^(- 1)3+c o s e c^(- 1)sqrt(5))=pi

cot^(-1)(cot((5pi)/6)) =