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सिद्ध कीजिए कि sin^(2) 42^(@) - cos^(...

सिद्ध कीजिए कि ` sin^(2) 42^(@) - cos^(2) 78^(@) = (sqrt5+1)/8`

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

Prove that sin^(2)42^(@)-cos^(2)78^(@) .

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

Prove that: sin^(2)42^(2)-cos^(2)78^(@)=(sqrt(5)+1)/(8)

Prove that: sin^(2)42^(0)-cos^(2)78^(0)=(sqrt(5)+1)/(8)

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

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

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

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

cos6^(@) cos42^(@) cos66^(@) cos78^(@) =