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The values of cos^2 73^0+cos^2 47^0-sin^...

The values of `cos^2 73^0+cos^2 47^0-sin^2 43^0+sin^2 107^0` is equal to: (b) `1/2` (c) `(sqrt(3))/2` (d) `sin^2 73^@+cos^4 73^@`

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