(1+tan18^(@))(1+tan27^(@))=

The expression ((1+tan37^(@))(1+tan8^(@))(1+tan15^(@))(1+tan30^(@)))/((1+tan2^(@))(1+tan43^(@))) reduces to

The value of tan27^(@)+tan18^(@)+tan27^(@)tan18^(@), is -A) an rrational number (B) rational which is an integer (C) integer which is prime (D) integer which is not prime

The value of the expression tan13^(@)tan27^(@)+tan27^(@)tan50^(@)+tan50^(@)tan13^(@) is equal to

The value of tan 81^(@) - tan 63^(@) - tan 27^(@)+ tan 9^(@) is equal to

The vlaue of tan 81^(@) - tan 63^(@) - tan 27^(@)+ tan 9^(@) is equal to

Prove that tan 9 ^(@) - tan 27 ^(@)- cot 27 ^(@) + cot 9^(@)=4

Prove that: (a) tan 20^(@)tan40^(@)tan60^(@)tan 80^(@)=3 (b) tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=4

Find the value of (tan 42^@ + tan 18^@)/(1-tan 42^@ tan 18^@)+ tan 300^@

Find the value of (tan 9^(@)+cot9^(@))/(tan27^(@)+cot27^(@)) .