The value of `sin^2 12^0+sin^2 21^0+sin^2 39^0+sin^2 48^0-sin^2 9^0-sin^2 18^0` is _______

Write the value of s in12^(0)sin48^(0)sin54^(@)

Find the value of 2sin 30^@ +cos 0^@ +3 sin 90^@ .

Prove that: sin^(2)12^(@)+sin^(2)21^(@)+sin^(2)39^(@)+sin^(2)48^(@)=1+sin^(2)9^(@)+sin^(2)18^(@)

sin12^(0)sin48^(@)sin54^(@)=

Prove that sin^(2) 12^circ + sin^(2)21^circ + sin^(2)39^circ + sin^(2)48^circ = 1 + sin^(2)9^circ + sin^(2)18^circ

cos^(2)48^(0)-sin^(2)12^(0) is