" 35."(cos35^(@))/(sin55^(@))+(sin11^(@))/(cos79^(@))-cos28^(@)*cosec62^(@)

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 ?

Without using Trigonometric Tables evaluate the following :- (cos35^@)/(sin55)+(sin11^@)/(cos79^@)-cos28^@ cosec62^@ .

(cos 28^(@))/(sin 62^(@))=?

(cos 28^(@))/(sin 62^@)=?

(cos 62^@)/(sin 28^@) =?

(cos20^(@)35')/(sin69^(@)25') is

Simplify (sin35^(@))/(cos55^(@))+(cos55^(@))/(sin35^(@))-2cos^(2)60^(@)

Evaluate : (i) (cos 55^(@))/(sin 35^(@)) + (cot 35^(@))/(tan 55^(@)) (ii) sin 42^(@) sin 48^(@) - cos 42^(@) cos 48^(@)

Evaluate the following: (i) (cot40^@)/(tan50^@)-1/2((cos35^@)/(sin55^@)) (ii) ((sin27^@)/(cos63^@))^2-((cos63^@)/(sin27^@))^2