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

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

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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^(@)) .

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

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

Prove that cos^(2)48^(@)-sin^(2)12^(@)=((sqrt5+1))/(8) .