" 10.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^(@)

find the value of sin60^(@)cos30^(@)+sin30^(@)cos60^(@)

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

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

Find the value of (sin30^@+cos30^@)(sin60^@+cos60^@)

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

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

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

Without using Trigonometric tables, evaluate:- (cos^2 20^@+cos^2 70^@)/(sin^2 59^@+sin^2 31^@) .