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

Evaluate the following: (i) (sin20o)/(cos70o)( ii) (cos19o)/(sin71o)

Evaluate the following: (i) ((sin49^@)/(cos41^@))^2+((cos41^@)/(sin49^@))^2 (ii) cos48^@-sin42^@

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

Evaluate the following: (i) (tan35^@)/(cot55^@)+(cot78^@)/(tan12^@)-1 (ii) (sec70^@)/(cos e c\ 20^@)+(sin59^@)/(cos31^@)

Find the value of the following: (cos70^(@))/(sin20^(@))+(cos59^(@))/(sin31^(@))+(costheta)/(sin(90^(@)-theta))-8cos^(2)60^(@)

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

Evaluate the following: (i) ((sin35)/(cos55))^2+((cos55)/(sin35))^2-2cos60 (ii) (2cos67)/(sin23)-(tan40)/(cot50)-cos0

Evaluate the following: (i) cos e c\ 31^@-sec59^@ (ii) (sin72^@+cos18^@)(sin72^@-cos18^@)

Evaluate each of the following: (i) sin^(-1)(sin(-600^o)) (ii) \ cos^(-1)(cos(-680^o))

Find sin 20^@ -cos 70^@ .