`cot10^@cot20^@cot60^@cot70^@cot80^@=`

The value of cot10^@ cot20^@ cot60^@ cot 70^@ cot 80^@ is

Find the value of cot 12^@ cot38^@cot 52^@cot78^@cot60^@ .

Evaluate :   cot 10^@.cot 20^@. cot 30^@.cot 40^@......   cot 90^@

Without using trigonometric tables , prove that : (i) tan20^(@)tan40^(@) tan45^(@)tan50^(@)tan70^(@)=1 (ii) tan1^(@) tan2^(@)tan60^(@)tan88^(@)tan89^(@)=sqrt(3) (iii) cot5^(@)cot10^(@)cot30^(@)cot80^(@)cot85^(@)=sqrt(3) (iv) 4sin10^(@)sin20^(@)sin30^(@)sec70^(@)sec80^(@)=2

Without using trigonometric tables , prove that : (i) tan20^(@)tan40^(@) tan45^(@)tan50^(@)tan70^(@)=1 (ii) tan1^(@) tan2^(@)tan60^(@)tan88^(@)tan89^(@)=sqrt(3) (iii) cot5^(@)cot10^(@)cot30^(@)cot80^(@)cot85^(@)=sqrt(3) (iv) 4sin10^(@)sin20^(@)sin30^(@)sec70^(@)sec80^(@)=2

What is the value of cot35^@ cot40^@ cot45^@ cot50^@ cot55^@ ? cot35^@ cot40^@ cot45^@ cot50^@ cot55^@ का मान क्या है ?

Evaluate : cot 10^(@) .cot20^(@).cot30^(@).cot40^(@) ………cot90^(@) .

Value of (3+cot80^(@)cot20^(@))/(cot80^(@)+cot20^(@)) is equal to (a) cot20^(@)(b)tan50^(@)(c)cot50^(@)(d)cot sqrt(20^(@))

If (3+cot80^(@)cot 20^(@))/(cot80^(@)+cot20^(@))=tan.(pi)/(k) , then the value of k is (where, (pi)/(k) is an acute angle)

Prove that cot12^(@)cot38^(@)cot52^(@)cot78^(@)cot60^(@)=(1)/(sqrt3)