[((tan20^(@))/(cosec70^(@)))^(2)+((cot20^(@))/(sec70^(@)))^(2)+],[2tan15^(@)tan37^(@)tan53^(@)tan60^(@)t]

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

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^(@)

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

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^@ .

What is the value of (tan^(2)25^(@))/(cosec^(2)65^(@))+(cot^(2)25^(@))/(sec^(2)65^(@))+tan20^(@)45^(@)tan70^(@) ?

Without using the trigonometric tables, evaluate the following : (11)/(7) (sin 70^(@))/(cos 20^(@)) - (4)/(7) (cos 53^(@) "cosec" 37^(@))/(tan 15^(@) tan 35^(@) tan 55^(@) tan 75^(@))

Prove that tan70^(@)=2tan50^(@)+tan20^(@)

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