`tan 20^@ tan 40^@ tan 80^@`

Solve the following : (2sin22^@)/(cos68^@)-(2cot75^@)/(5 tan15^@)-(8 tan 45^@ tan20^@ tan 40^@ tan 50^@ tan70^@)/5

Prove that : (i) (sin 70^@)/(cos 20^@)+(cosec 20^@)/(sec 70^@)-2cos 70^@cosec 20^@=0 (ii) (cos 80^@)/(sin 10^@)+cos 59^@cosec 31^@=2 (iii) (2 sin 68^@)/(cos 22^@)-(2 cot 15^@)/(5 tan 75^@)-(3tan 45^@tan 20^@tan 40^@tan 50^@tan 70^@)/(5)=1 (iv) (sin 18^@)/(cos 72^@)+sqrt(3) (tan 10^@ tan 30^@tan 40^@tan 50^@tan 80^@)=2 (v) (7cos 55^@)/(3 sin 35^@)-(4(cos 70^@cosec 20^@))/(3(tan 5^@tan 25^@tan 45^@tan 65^@tan 856^@))=1

tan20^(@)tan40^(@)tan80^(@)

Prove that tan20^(@)tan40^(@)tan80^(@)=tan60^(@)

Prove that: tan20^(@)tan40^(@)tan80^(@)=tan60^(@)

If tan20^(@)+tan40^(@)+tan80^(@)-tan60^(@)=lambda sin40^(0)

(tan20^(@)tan40^(@)tan80^(@))^(2) is a prime number. True or false