(cot^2 15^@-1)/(cot^2 15^@+1)=...

`(cot^2 15^@-1)/(cot^2 15^@+1)=`

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tan15^(@)-cot15^(@)=

cot 15^(@) + cot 75^(@) + cot 315^(@) =

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

cot7(1^@)/2-cot37(1^@)/2-cot52(1^@)/2+cot82(1^@)/2 =

Prove that (tan75^(@))/(cot15^(@))=1

The value of cot 15^(@) cot 16^(@) cot 17^(@) . . . . . cot 73^(@) cot 74^(@) cot 75^(@) is :

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

Show that tan 15^@ + cot 15^@ = 4

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