Without using trigonometric tables , evaluate : `((tan20^(@))/(cosec70^(@)))^(2)+((cot20^(@))/(sec70^(@)))^2+2tan 15^(@)tan37^(@)tan53^(@)tan60^(@)tan75^(@)`

Find the value of ((tan20^(@))/(cos e)c70^(@))^(2)+((cot20^(@))/(sec70^(@)))^(2)+2tan75^(@)tan45^(@)tan15^(@)

Without using Trigonometric Tables evaluate the following :- ((tan20^@)/(cosec70^@))^2+((cot20^@)/sec70^@)+2tan15^@tan37^@tan53^@tan60^@tan75^@ .

Find value of ((tan20^@)/(cosec 70^@))^2+((cot20^@)/(sec70^@))^2+2tan15^@tan37^@tan53^@tan60^@tan75^@ .

Without using trigonometric tables , prove that : (i) tan20^(@)tan40^(@) tan45^(@)tan50^(@)tan70^(@)=1 (ii) tan1^(@) tan2^(@)tan60^(@)tan88^(@)tan89^(@)=sqrt(3) (iii) cot5^(@)cot10^(@)cot30^(@)cot80^(@)cot85^(@)=sqrt(3) (iv) 4sin10^(@)sin20^(@)sin30^(@)sec70^(@)sec80^(@)=2

Without using trigonometric tables , prove that : (i) tan20^(@)tan40^(@) tan45^(@)tan50^(@)tan70^(@)=1 (ii) tan1^(@) tan2^(@)tan60^(@)tan88^(@)tan89^(@)=sqrt(3) (iii) cot5^(@)cot10^(@)cot30^(@)cot80^(@)cot85^(@)=sqrt(3) (iv) 4sin10^(@)sin20^(@)sin30^(@)sec70^(@)sec80^(@)=2

Evaluate : 2((cos65^(@))/(sin25^(@)))-(tan20^(@))/(cot70^(@))-sin90^(@)+tan5^(@)tan35^(@)tan60^(@)tan55^(@)tan85^(@)

Evaluate : 2((cos65^(@))/(sin25^(@)))-(tan20^(@))/(cot70^(@))-sin90^(@)+tan5^(@)tan35^(@)tan60^(@)tan55^(@)tan85^(@)

The value of the following is : (tan20^(@))^(2)/(("cosec"70^(@))^(2))+((cot20^(@))^(2))/("sec70^(@))^(2)+2tan15^(@).tan45^(@).tan75^(@)

Evaluate tan20^(@)tan25^(@)tan65^(@)tan70^(@) .

Evaluate tan20^(@)tan25^(@)tan65^(@)tan70^(@) .