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  3. use a half-angle identity to find the exact value.

Use a half-angle identity to find the exact value.cos 112.5cos 112.5 =(Simplify your answer, including...

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Use a half-angle identity to find the exact value.cos 112.5cos 112.5 =(Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)

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