`(sin31^(@))/(2cos59^(@))=`

(sin30^(@)17)/(cos59^(@)43)

Consider the following : 1. (cos 75^(@))/(sin 15^(@)) + (sin 12^(@))/(cos 78^(@)) - (cos 18^(@))/(sin 72^(@)) =1 2. (cos 35^(@))/(sin 55^(@)) - (sin 11^(@))/(9cos 79^(@)) + cos 28^(@) "cosec" 62^(@) =1 3. (sin 80^(@))/(cos 10^(@)) - sin 59^(@).sec 31^(@) =0 Which of the above are correct ?

Prove that ((cos70^(@))/(sin20^(@)))+((cos59^(@))/(sin31^(@)))-8cos^(2)60^(@)=0

Evaluate : (cos 70^(@))/(sin 20^(@))+(cos 59^(@))/(sin31^(@))-8sin^(2)30^(@)

(cos70^(@))/(sin20^(@))+(cos59^(@))/(sin31^(@))=8sin^(2)30^(@)

Evaluate : (cos 70^(@))/(sin 20^(@))+(cos 59^(@))/(sin31^(@))-8sin^(2)30^(@)

(cos 70^(@))/(sin 20^(@)) + (cos 59^(@))/(sin 31^(@) ) - 8 sin^(2) 30^(@) is equal to

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