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

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

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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.

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