The value of `(6sin20^(@)-8sin^(3)20^(@))^(4)` is equal to

Find the value of 3sin20^(@)-4sin^(3)20^(@).

The value of sin^(3)10^(@)+sin^(3)50^(@)-sin^(3)70^(@) is equal to (a)-(3)/(2) (b) (3)/(4)(c)-(3)/(4)(d)-(3)/(8)

tan20^(@)+4sin20^(@)

The value of (sin10^(@)+sin20^(@))/(cos10^(@)+cos20^(@)) equals

The value of (tan^(2)20^(@)-sin^(2)20^(@))/(tan^(2)20^(@).sin^(2)20^(@)) is

What is sin^(2)20^(@)+sin^(2)70^(@) equal to ?

sin^(2)20+sin^(2)70 is equal to _________.