`(1-4 sin 10^(@) sin70^(@))/(2 sin 10^(@))=`

The value of the expession (1- 4 sin 10^(@) sin 70^(@))/(2 sin 10 ^(@))

sin 50 ^(@) - sin 70^(@) + sin 10^(@)

(cos 20^(@)+8 sin 70^(@) sin 50^(@) sin 10^(@))/( sin^(2)80^(@)) is equal to

sin50^(@)-sin70^(@)+sin10^(@)=?

sin 10^(@) sin 30^(@) sin 50^(@) sin 70^(@) sin 90^(@)=

Prove that sin 50^(@) - sin 70^(@) +sin 10^(@) =0 .

Write the value of the expression 1-4sin10^(0)sin70^(@)2sin10^(0)

Prove the following: (i) "sin" 10^(@) sin 50^(@) sin 70^(@)=(1)/(8) (ii) "sin" 10^(@) sin 30^(@) sin 50^(@) sin 70^(@)=(1)/(16)

sin 10^(@) + sin 20^(@) + sin 40^(@) + sin 50^(@) - sin 70^(@) - sin 80^(@) =