pub fn cosl(x: c_longdouble) callconv(.c) c_longdouble
pub fn cosl(x: c_longdouble) callconv(.c) c_longdouble { switch (@typeInfo(c_longdouble).float.bits) { 64 => return cos(x), 80 => return cosx(x), 128 => return cosq(x), else => @compileError("unreachable"), } }