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" 2."sin^(2)48^(@)-cos^(2)12^(@)...

" 2."sin^(2)48^(@)-cos^(2)12^(@)

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

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

cos^(2)48^(@)-sin^(2)12^(@)=?

The value of "cos"^(2)48^(@)-"sin"^(2)12^(@) is

The value of cos^(2)48^(@)-sin^(2)12^(@) is

The value of cos^(2)48^(@)-sin^(2)12^(@) is

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Find the value of (a) sin(pi)/(10).sin(13pi)/(10) (b) cos^(2)48^(@)-sin^(2) 12^(@)

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