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cos^2 48^0-sin^2 12^0 is...

`cos^2 48^0-sin^2 12^0` is

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cos^2 48^@-sin^2 12^@=

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

Find the value of cos^2 48^@-sin^2 12^@

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

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 is _______

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 _______

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 _______

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 _______

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