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#ifndef M_PI
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#ifndef M_PI
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#define M_PI		3.141592653589793238462643383280	/* pi */
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#define M_PI		3.141592653589793238462643383280	/* pi */
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#endif
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#endif
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#ifndef M_2PI
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#define M_2PI		6.283185307179586476925286766559	/* 2*pi */
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#endif
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#ifndef M_PI_2
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#ifndef M_PI_2
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#define M_PI_2		1.570796326794896619231321691640	/* pi/2 */
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#define M_PI_2		1.570796326794896619231321691640	/* pi/2 */
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#endif
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#endif
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#ifndef M_PI_4
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#ifndef M_PI_4