Evaluate : `tan35^0tan40^0tan45^0tan50^0tan55^0`

Evaluate : tan7^0tan23^0tan60^0tan67^0tan83^0

Prove that tan20^0tan40^0tan80^0=tan60^0

Prove that: tan20^0tan40^0tan80^0=tan60^0

Evaluate tan 40^@ xx tan 50^@

Evaluate tan 40^@ xx tan 50^@

Evaluate : ( (3cos55^0) / (7sin35^0))-(4/7)(cos70^0cos e c20^0)/(tan5^0tan25^0tan45^0tan65^0tan85^0

Prove that: t a n 20^0tan40^0tan60^0tan80^0=3

Evaluate each of the following: (a) cos(40^0-theta)-sin(50^0+theta)+(cos^2 40^0+cos^2 50^0)/(sin^2 40^0+sin^2 50^0) (b) (cos70^0)/(sin20^0)+(cos55^0cos e c35^0)/(tan5^0tan25^0tan45^0tan65^0tan85^0) (c) 2((cos58^0)/(sin32^0))-sqrt(3)((cos38^0cos e c52^0)/(tan15^0tan60^0t a n75^0))

Evaluate : (2sin68^0)/(cos22^0)-(2cot15^0)/(5tan75^0)-(3tan45^0tan20^0tan40^0tan50^0tan70^0)/5

Prove tan 20^0 tan 30^0 tan 40^0 tan 80^0=1