`sin42^@sec48^@+cos42^@cosec48^@ = 2`

Show that: sin 42^(@)sec 48^(@)+cos 42^(@)cosec 48^(@)=2

Prove that: sin48^@sec42^@+cos48^@\ cos e c\ 42^@=2

Show that : (i) tan 10^(@) tan 15^(@) tan 75^(@) tan 80^(@) = 1 (ii) sin 42^(@) sec 48^(@) + cos 42^(@) "cosec 48"^(@) = 2

sin48^(@)sec42^(@)+cos48^(@)csc42^(@)=

Evaluate: sin 42^(@)sin 48^(@)-cos 42^(@)cos 48^(@)

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

Find the value of sin 48^(@) sec 42^(@)+cos48^(@) "cosec"42^(@).

Prove that : (i) sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1 (ii) cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0

Prove that : (i) sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1 (ii) cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0

Evaluate: i) sin48^(@)cos42^(@)+cos48^(@)sin42^(@) ii) cos72^(@)cos12^(@)+sin72^(@)sin12^(@) ii) cos72^(@)cos12^(@)+sin72^(@)sin12^(@) iii) (tan100^(@)+tan35^(@))/(1-tan100^(@)tan35^(@)) iv) sinAcos(A-B)-cosAsin(A-B)