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" (2) "tan9^(@)+tan36^(@)+tan9^(@)tan36^...

" (2) "tan9^(@)+tan36^(@)+tan9^(@)tan36^(@)=1

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The value of tan9^(@)+tan36^(@)+tan9^(@)*tan36^(@) is equal to

tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=

tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=?

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

Prove that: i) tan36^(@)+tan9^(@)+tan36^(@)tan9^(@)=1

Prove that: i) tan36^(@)+tan9^(@)+tan36^(@)tan9^(@)=1

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

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

tan9^(0)-tan27^(0)-tan63^(@)+tan81^(@)