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[" (a) "(1-x)/(2x)quad " (b) "(14x^(2))/...

[" (a) "(1-x)/(2x)quad " (b) "(14x^(2))/(2x)],[" 4.The value of "sin78^(@)-sin66^(@)-sin42^(@)+sin6^(@)15],[[" (a) "(1)/(2)," (b) "(1)/(2)]]

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sin78^(@)-sin66^(@)-sin42^(@)+sin6^(@) is

The value of sin 78^@ - sin 66^@ - sin 42^@ + sin 6^@ is

The value of sin 78^@ - sin 66^@ - sin 42^@ + sin 6^@ is

The value of sin 78^@ - sin 66^@ - sin 42^@ + sin 6^@ is

sin6^(@)sin42^(@)sin66^(@)sin78^(@)=

Find sin6^(@)sin42^(@)sin66^(@)sin78^(@) .

Prove that: sin6^(@)sin42^(@)sin66^(@)sin78^(@)=1/16