概要	double __atan ( double x); /* number to calculate arc tangent of */
説明	__atan デバッガ関数は、浮動小数点数 x の弓形正接を計算します。__atan によって返される浮動小数点値は、-π/2 ～ π/2 の範囲の数です。
戻り値	__atan 関数は、x の弓形正接を返します。
関連項目	__acos、__asin
例	> __atan(3);

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