Evaluate: `sin 35^(@) cdot sin 55^(@) - cos 35^(@) cdot cos 55^(@).`

Evaluate : (sin 35^(@) cos 55^(@) + cos 35^(@) sin 55^(@))/ (cosec^(2) 10^(@) - tan^(2) 80^(@))

Evaluate: sin 35 / cos 55

Evaluate: sin^(2)35^(@)-cos^(2)55^(@)

Evaluate (sec 35^(@))/( cosec 55^(@))

Evaluate (sec 35^(@))/( cosec 55^(@))

Evaluate (sec 35^(@))/( cosec 55^(@))

Evaluate (sec 35^(@))/( cosec 55^(@))

Evaluate (sec 35^(@))/( cosec 55^(@))

sin 85^(@)-sin 35^(@) - cos 65^@

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