" (a)Show that "sin42^(@)sec48^(@)+cos42^(@)cosec48^(@)=2

sin42^(@)sec48^(@)+cos42^(@)cos ec48^(@)=2

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

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

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

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

cos48^(@)cos23^(@)cos ec42^(@)cos ec67^(@)=1

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

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

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