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

[" The value of "cos^(2)48^(@)-sin^(2)12^(@)" is "],[" O "(sqrt(5)+1)/(2sqrt(2))],[" [O) "(sqrt(5)-1)/(8)],[" O "(sqrt(5)+1)/(8)]

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

The value of cos^(2)48^(@)-sin^(2)12^(@) is ........... A) (sqrt5-1)/( 4) B) (sqrt5+1)/(8) C) (sqrt3-1)/(4) D) (sqrt3+1)/(2sqrt2)

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

The value of cos48cos12 (A) (sqrt(5)+3)/(8) (B) (3-sqrt(5))/(2) (C) (sqrt(5)+1)/(4) (D) (sqrt(5)-1)/(4)

sin ^(2) 24 ^(@) - sin ^(2) 6^(@) = (sqrt5 -1)/(8).

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

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

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

The value of (cos^(3)20o-cos^(3)70o)/(sin^(3)70o-sin^(3)20o) is (1)/(2)(b)(1)/(sqrt(2))(c)1(d)2

The value of {(sqrt(2) +1)^(5) + (sqrt(2) -1)^(5)} ,is