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

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

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

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

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

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

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

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Find the value of (cos^(2)66^(@)-sin^(2)6^(@))(cos^(2)48^(@)-sin^(2)12^(@)) .

Find the value of (cos^(2)66^(@)-sin^(2)6^(@))(cos^(2)48^(@)-sin^(2)12^(@)) .