`sin 36^(º)sin 72^(º) + 108^(º) sin 144^(º) = `

sin 36^(º)sin 72^(º) sin108^(º) sin 144^(º) =

Prove that cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

The value of sin 10^(@) sin 30^(@) sin 50^(@) sin 70^(@) is equal to .

Prove that: sin36^0s in 72^0s in 108^0s in 144^0=5/(16)dot

Prove that : sin 10^(@) + sin 20^(@) + sin 40^(@) + sin 50^(@) = sin 70^(@) + sin 80^(@).

Let P=sin 25^(@) sin 35^(@)sin 60^(@) sin 85^(@) and Q=sin20^(@)sin40^(@)sin 75^(@) sin 80^(@) . Which of the following relation (s) is (are) correct ?

The value of (sin 1^(@) +sin 3^(@) + sin 5^(@) +sin 7^(@))/(cos 1^(@)*cos 2^(@)sin 4^(@)) is __________

Prove that sin 12^(@) sin18^(@)sin42^(@) sin48^(@) sin 72^(@) sin78^(@)=(cos18^(@))/(32) .

Show that sin 19^(@) + sin 41^(@) + sin 83^(@) = sin 23 ^(@) + sin 37^(@) + sin 79^(@).

The value of sin12^(@)sin24^(@)sin48^(@)sin84^(@), is