Evaluate the following: (i) `(sin20^@)/(cos70^@)` (ii) `(cos19^@)/(sin71^@)`

Evaluate the following: (i) (cos37^(@))/(sin53^(@))(ii)(sin41^(@))/(cos49^(@))(iii)(tan54^(@))/(cot36^(@))

Evaluate the following: ( i ) ((sin49o)/(cos410))^(2)+((cos410)/(sin49o))^(2) (ii) cos48o-sin42o

(sin19^(@))/(cos71^(@))+(cos73^(@))/(sin17^(@))

Find the values of the following: (i) sin75^(@) (ii) cos15^(@)

Find sin 20^@ -cos 70^@ .

Evaluate the following: cos80^(@)cos20^(@)+sin80^(@)sin20^(@)

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=?

Without using trigonometric tables,evaluate each of the following: (sin^(2)20^(@)+sin^(2)70^(@))/(cos^(2)20^(0)+cos^(2)70^(@))+(sin(90^(@)-theta)sin theta)/(tan theta)+(cos(90^(@)-theta)cos theta)/(cot theta)+cos(40^(0)+theta)-sin(50^(@)-theta)+(cos^(2)40^(0)+cos^(2)50^(@))/(sin^(2)40^(0)+sin^(2)50^(@))

cos70^(@)+sin40^(@)=