Find the value of `(tan20^@/cosec 70^@)^2+(cot 20^@/sec70^@)^2+2tan75^@ tan45^@ tan 15^@`

Without taking the help of the table of tribonometric ratios,find the value of:(iv) (tan20^@/(cosec70^@))^2+(cot20^@/sec70^)^2 +2tan15tan45tan75

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

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

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 : ((3tan41^@)/(cot49^@))^2-((sin35^@ sec55^@)/(tan10^@ tan20^@ tan60^@ tan70^@ tan80^@))^2

Find the value of cot54^@/(tan36^@)+tan20^@/(cot70^@)

Find the value of cot54^@/(tan36^@)+tan20^@/(cot70^@)

Find the value of cot54^@/(tan36^@)+tan20^@/(cot70^@)