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2 mjames 1
#include "ref.h"
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q31_t ref_cos_q31(q31_t x)
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{
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        return (q31_t)(cosf((float32_t)x * 6.28318530717959f / 2147483648.0f) * 2147483648.0f);
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}
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q15_t ref_cos_q15(q15_t x)
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{
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        return (q15_t)(cosf((float32_t)x * 6.28318530717959f / 32768.0f) * 32768.0f);
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}