" 10.Without using trigonometric tables,find the value of "(cos70^(@))/(sin20^(@))+cos57^(@)cosec33^(@)-2cos60^(@).

Without using trigonometric tables.Find the value of (cos70)/(sin20)+cos57*cos ec33-2cos60

Without using trigonometric tables, show that (cos 70^(@))/( sin 20^(@)) + cos 49^(@) cosec41^(@) = 2

Without using trigonometric tables,find the value of ((sin50^(@))/(cos40^(@)))+((cos ec40^(@))/(sec50^(@)))-4cos50^(@)cos ec40^(@)

sec70^(@)sin20^(@)+cos20^(@)cosec70^(@)=2

Without using trigonometric tables, prove that sec70^(@)sin 20^(@) + cos 20^(@) cosec 70^(@)=2 .

sec70^(@)sin20^(@)+cos20^(@)"cosec"70^(@)=?

Without using trigonometric tables, find the value of : (2)/(3) ((sec 56^(@))/( cosec 34^(@))) - 2 cos^(2) 20^(@) + (1)/(2) cot 28^(@) cot 35^(@) cot 45^(@) cot 62^(@) cot 55^(@) - 2 cos ^(2) 70^(@)

Evalute (g) sec70^(@)sin20^(@)-cos70^(@)cosec20^(@)

Without using Trigonometric tables, evaluate:- 2(cos67^@)/(sin23^@)-(tan 40^@)/(cot50^@)-sin90^@ .

Without using trigonometric tables,evaluate the following:- 2((cos58^(@))/(sin32^(@)))-sqrt(3)((cos38^(@)cos ecs2^(@))/(tan15^(@)tan60^(@)tan75^(@)))