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The value of sin ^(2) 12 ^(@) + sin ^(2)...

The value of `sin ^(2) 12 ^(@) + sin ^(2) 12 ^(@) + sin ^(2) 39^(@) + sin ^(2) 48^(@) - sin ^(2) 9^(@) - sin ^(2) 18^(@) ` is `"______"`

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