sin^(2)42^(0)-sin^(2)12^(0)=

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Find the value of sin^(2)42^(@)-sin^(2)12^(@) .

Prove that: cos^(2)48^(0)-sin^(2)12^(0)=(sqrt(5)+1)/(8)

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)

sin^(2)12^(0)+sin^(2)21^(0)+sin^(2)39^(0)+ sin^(2)48^(2)-sin^(2)9^(0)- sin^(2) 18^(0)=

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

Prove that: sin^(2)42^(0)-cos^(2)78^(0)=(sqrt(5)+1)/(8)

[sin^(2)5^(0)+sin^(2)10^(0)+sin^(2)15^(0)+...........],[+sin^(2)90^(0)=..........]

cos^(2)48^(@)-sin^(2)12^(0) is equal to

Show that sin^(2)5^(@)+sin^(2)10^(0)+sin^(2)15^(0)+...+sin^(2)90^(@)=9(1)/(2)