tan72^(@)=tan18^(@)+2tan54^(@)

Prove that tan 72^(@)=tan 18^(@)+2 tan 54^(@)

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

Evaluate : tan7^(@)tan23^(@)tan60^(@)tan67^(@)tan83^(@)+(cot54^(@))/(tan36^(@))+sin20^(@)sec70^(@)-2

Evaluate : tan7^(@)tan23^(@)tan60^(@)tan67^(@)tan83^(@)+(cot54^(@))/(tan36^(@))+sin20^(@)sec70^(@)-2

(sin18^(0))/(cos72^(0))+(sin22^(0))/(cos68^(@))-(cos38^(0)cos ec52^(0))/(tan18^(@)tan35^(@)tan60^(@)tan72^(@)tan55^(@))

Choose the correct answer in each of the following questions: (cos38^(@)"cosec"52^(@))/(tan18^(@)tan35^(@)tan60^(@)tan72^(@)tan55^(@))=?

What is the value of (tan 9^(@) tan 23^(@) tan 60^(@) tan67^(@) tan 81^(@))/("cosec"^(2)72^(@)+cos^(2)15^(@)-tan^(2)18^(@)+cos^(2)75^(@))? (a) (1)/(2 sqrt(3)) (b) (sqrt(3))/(2) (c) (1)/(sqrt(3)) (d) 2 sqrt(3)

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

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